Error 500 Order by non-existing field 'datacard'.

[Dozent]

I installed the system from scratch. The error was due to the fact that by default there was a filter in the contacts for those columns that do not exist. Deleted it and the error is gone.

[shalmaxb]

It maybe, that from a former customization (with a field Datacard) there is anything still present or in your database or in you entityDefs json-file, which you later deleted.
In your database look in the table contact, if there is a field of such name.

In your file custom/Espo/Custom/Resources/metadata/entityDefs/contact.json look, if there is anything with that name and delete it there.

[Dozent]

An error appears on the contact page Error 500 Order by non-existing field 'datacard'. Version 7.2.6.