Hey there,
Hmmm, we might need a little more info around this
- What version of SuiteCRM is this on?
- What version of PHP/MySQL are you on? (Are you using supported versions, as per the compatibility matrix?)
- Did you install SuiteCRM from a package, or from git?
It sounds as though there missing libraries/vendor files
I would initially recommend running the “composer install --no-dev” command, in the root of your instance, to see if this fetches the missing content and resolves your issue.
(As this will could change/update files, feel free to backup your filesystem before running)
If running the above command doesn’t work, I had noticed a previous forum thread in which a user notes that disabling AOD resolved this issue
(Admin->AOD Settings)
Hopefully either of the above can assist!