Hi there,
KReporter is not supported on the later versions of SuiteCRM 7.10+ off the bat as there are incompatibilities in folder structures. The issue is that both applications use slim and thus conflicting with the names. So unfortunately it’s one or the other; disabling SuiteCRM API else KReporter. From a quick search a non upgrade change would be to rename vendor/slim to something else (but as I said that could cause SuiteCRM API v8 to be non functional).
^^ another thread on this.