And why could the Internal Server Error occur?

Question

Yii

For the first time I am transferring a yii2 advanced project from a local server to a hosting . I put everything in the public_html folder and as a result gives the following error:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at [email protected] to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log.
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

What could be the problem? maybe I did something wrong when transferring? Tell me, please, how to solve?