Bad server response

[JanBab]

Hi,
EspoCRM shows "Bad server response".
Log ending with following errors:

[2020-05-12 08:52:46] Espo.WARNING: E_WARNING: get_class() expects parameter 1 to be object, null given {"code":2,"message":"get_class() expects parameter 1 to be object, null given","file":"C:\\xampp\\htdocs\\espocrm\\applica tion\\Espo\\ORM\\Repositories\\RDB.php","line":70, "context":{"entityType":"AuthToken","entityManager ":"[object] (Espo\\Core\\ORM\\EntityManager: {})","entityFactory":"[object] (Espo\\ORM\\EntityFactory: {})"}} []
[2020-05-12 08:52:46] Espo.ERROR: Uncaught Exception TypeError: "Argument 1 passed to Espo\ORM\DB\Mapper::select() must implement interface Espo\ORM\IEntity, null given, called in C:\xampp\htdocs\espocrm\application\Espo\ORM\Repos itories\RDB.php on line 209" at C:\xampp\htdocs\espocrm\application\Espo\ORM\DB\Ma pper.php line 114 {"exception":"[object] (TypeError(code: 0): Argument 1 passed to Espo\\ORM\\DB\\Mapper::select() must implement interface Espo\\ORM\\IEntity, null given, called in C:\\xampp\\htdocs\\espocrm\\application\\Espo\\ORM \\Repositories\\RDB.php on line 209 at C:\\xampp\\htdocs\\espocrm\\application\\Espo\\ORM \\DB\\Mapper.php:114)"} []

Thanks

[Maximus]

Hello,
when exactly this error occurred? Try to logout and login again. Then try to reproduce the error again.

[JanBab]

It is not possible to login. EspoCRM shows this error on login page.
The log is constantly growing. There are approximately 5 of these errors every minute.

[Maximus]

Try to make rebuild via CLI

php rebuild.php

[JanBab]

Everythings works ....
Here is how ...
1. Rename directory "Resources" (espocrm\custom\Espo\Custom) to ...\Resources_OLD
2. Remove directory "application" (espocrm\data\cache)
3. Login to EspoCRM
4. Run Clear cache and Rebuild
5. Rename directory Resources_OLD back to Resources