Does not install on Laravel 6.15.0

[klimenttoshkov]

composer require brexis/laravel-workflow
Using version ^1.3 for brexis/laravel-workflow
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1
- Conclusion: don't install brexis/laravel-workflow 1.3.3
- Conclusion: don't install brexis/laravel-workflow 1.3.2
- Conclusion: don't install brexis/laravel-workflow 1.3.1
- Installation request for symfony/workflow (locked at v5.0.4, required as ^5.0) -> satisfiable by symfony/workflow[v5.0.4].
- Conclusion: remove laravel/framework v6.15.0
- Installation request for brexis/laravel-workflow ^1.3 -> satisfiable by brexis/laravel-workflow[1.3.0, 1.3.1, 1.3.2, 1.3.3].
- Conclusion: don't install laravel/framework v6.15.0
- brexis/laravel-workflow 1.3.0 requires illuminate/support 5.3.* || 5.4.* || 5.5.* || 5.6.* || 5.7.* || 5.8.* -> satisfiable by illuminate/support[5.3.x-dev, 5.4.x-dev, 5.5.x-dev, 5.6.x-dev, 5.7.17, 5.7.18, 5.7.19, 5.7.x-dev, 5.8.x-dev, v5.3.0, v5.3.16, v5.3.23, v5.3.4, v5.4.0, v5.4.13, v5.4.17, v5.4.19, v5.4.27, v5.4.36, v5.4.9, v5.5.0, v5.5.16, v5.5.17, v5.5.2, v5.5.28, v5.5.33, v5.5.34, v5.5.35, v5.5.36, v5.5.37, v5.5.39, v5.5.40, v5.5.41, v5.5.43, v5.5.44, v5.6.0, v5.6.1, v5.6.10, v5.6.11, v5.6.12, v5.6.13, v5.6.14, v5.6.15, v5.6.16, v5.6.17, v5.6.19, v5.6.2, v5.6.20, v5.6.21, v5.6.22, v5.6.23, v5.6.24, v5.6.25, v5.6.26, v5.6.27, v5.6.28, v5.6.29, v5.6.3, v5.6.30, v5.6.31, v5.6.32, v5.6.33, v5.6.34, v5.6.35, v5.6.36, v5.6.37, v5.6.38, v5.6.39, v5.6.4, v5.6.5, v5.6.6, v5.6.7, v5.6.8, v5.6.9, v5.7.0, v5.7.1, v5.7.10, v5.7.11, v5.7.15, v5.7.2, v5.7.20, v5.7.21, v5.7.22, v5.7.23, v5.7.26, v5.7.27, v5.7.28, v5.7.3, v5.7.4, v5.7.5, v5.7.6, v5.7.7, v5.7.8, v5.7.9, v5.8.0, v5.8.11, v5.8.12, v5.8.14, v5.8.15, v5.8.17, v5.8.18, v5.8.19, v5.8.2, v5.8.20, v5.8.22, v5.8.24, v5.8.27, v5.8.28, v5.8.29, v5.8.3, v5.8.30, v5.8.31, v5.8.32, v5.8.33, v5.8.34, v5.8.35, v5.8.36, v5.8.4, v5.8.8, v5.8.9].
- don't install illuminate/support 5.5.x-dev|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.0|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.16|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.17|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.2|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.28|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.33|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.34|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.35|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.36|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.37|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.39|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.40|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.41|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.43|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.5.44|don't install laravel/framework v6.15.0
- don't install illuminate/support 5.6.x-dev|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.0|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.1|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.10|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.11|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.12|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.13|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.14|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.15|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.16|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.17|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.19|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.2|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.20|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.21|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.22|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.23|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.24|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.25|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.26|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.27|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.28|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.29|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.3|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.30|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.31|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.32|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.33|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.34|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.35|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.36|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.37|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.38|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.39|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.4|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.5|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.6|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.7|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.8|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.6.9|don't install laravel/framework v6.15.0
- don't install illuminate/support 5.7.17|don't install laravel/framework v6.15.0
- don't install illuminate/support 5.7.18|don't install laravel/framework v6.15.0
- don't install illuminate/support 5.7.19|don't install laravel/framework v6.15.0
- don't install illuminate/support 5.7.x-dev|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.0|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.1|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.10|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.11|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.15|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.2|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.20|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.21|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.22|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.23|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.26|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.27|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.28|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.3|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.4|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.5|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.6|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.7|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.8|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.7.9|don't install laravel/framework v6.15.0
- don't install illuminate/support 5.8.x-dev|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.0|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.11|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.12|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.14|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.15|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.17|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.18|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.19|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.2|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.20|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.22|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.24|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.27|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.28|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.29|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.3|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.30|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.31|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.32|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.33|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.34|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.35|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.36|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.4|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.8|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.8.9|don't install laravel/framework v6.15.0
- don't install illuminate/support 5.3.x-dev|don't install laravel/framework v6.15.0
- don't install illuminate/support 5.4.x-dev|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.3.0|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.3.16|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.3.23|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.3.4|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.4.0|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.4.13|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.4.17|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.4.19|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.4.27|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.4.36|don't install laravel/framework v6.15.0
- don't install illuminate/support v5.4.9|don't install laravel/framework v6.15.0
- Installation request for laravel/framework (locked at v6.15.0, required as ^6.2) -> satisfiable by laravel/framework[v6.15.0].

Installation failed, reverting ./composer.json to its original content.

[Azmeer-crescent]

I get this error:
Symfony\Component\Debug\Exception\FatalThrowableError
Argument 1 passed to Brexis\LaravelWorkflow\WorkflowRegistry::__construct() must be of the type array, null given, called in \vendor\brexis\laravel-workflow\src\WorkflowServiceProvider.php on line 41

Laravel version 6.18.3, PHP 7.4.2

[brexis]

The supported versions of symfony/workflow are 3.x and 4.x. It seems your composer.json is locked to symfony:workflow 5.0.4. You may need to downgrade to 4.x.