You need to install your composer dependencies before using them.
– IGPJan 20 '21 at 18:56
We'll need more information for this to be answerable. Did you attempt to install this project via composer? Did you invoke the composer's autoloader (Laravel probably does this for you)? Please the steps you took to install the package, and some code that demonstrates the issue
– HPierceJan 21 '21 at 01:19