Hi @mean2701,
Your post is missing essential information, you did simply brush aside the support template. Furthermore you did obviously not read the manual or used the search function of the forum.
These are very common error messages and there are already multiple topics in the forum about it.
If your nextcloud is a baremetal installation (no Docker, no AIO, no Snap, no ncp) on a debian/ubuntu system - which I can not know because you skipped the support template - then this error:
… can simply be fixed with the → nc-integrity-fix script ←
I hope this resolves your integrity check issue!
Much and good luck,
ernolf