The trait Maatwebsite\Excel\Concerns\Exportable requires some properties which are not provided by App\Exports\ExaminationStudentsExport: $disk, $diskOptions, $fileName, $filePath, $writerType, $headers
The expression return App\Models\Examin...('grade', $this->grade) also could return the type Illuminate\Database\Eloq...\Database\Query\Builder which is incompatible with the documented return type Illuminate\Support\Collection.
This check compares calls to functions or methods with their respective definitions.
If the call has more arguments than are defined, it raises an issue.
If a function is defined several times with a different number of parameters, the
check may pick up the wrong definition and report false positives. One codebase
where this has been known to happen is Wordpress. Please note the @ignore annotation hint above.