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Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 21.0.1 Operating system and version _(eg, Ubuntu 20.04)_: Synology dsm 7
Apache or nginx version (eg, Apache 2.4.25): 2.4 PHP version _(eg, 7.4)_: 7.4`
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): y
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
After i updates to last version 21.0.1 i installed plugin Reader (ebook reader) then i see this error:
Internal Server Error
The server was unable to complete your request.
If this happens again, please send the technical details below to the server administrator.
More details can be found in the server log.
Technical details
- Remote Address: xxxxxxxx
- Request ID: 2nCUSBFdZbxK92WSuix6
Is there anyway to remove “Ebook reader” ?
Thank you!
