H5P library shows error

**Describe the bug**
Declaration of Djoudi\LaravelH5p\Repositories\LaravelH5pRepository::setErrorMessage($message) must be compatible with H5PFrameworkInterface::setErrorMessage($message, $code = NULL)

**To Reproduce**
Steps to reproduce the behavior:
1. open /h5p
2. Click on h5p library
3. shows the error above 

