System.DmlException: Update failed. first error: INVALID_CROSS_REFERENCE_KEY, - salesforce

Question

i am trying to update a ObjectPermissions Object in slaesforce such that a profile will get the permissions to access a object similar to other profile.
i write a code
my code segment is
PermissionSet set1 = [SELECT Id From PermissionSet
WHERE profileId = : SourceProfileId LIMIT 1] ;
PermissionSet set2 = [SELECT Id FROM PermissionSet
WHERE profileId = : TargetProfileId LIMIT 1];
List<ObjectPermissions> oo = [SELECT Id,
SObjectType,
ParentId,
PermissionsCreate,
PermissionsDelete,
PermissionsEdit,
PermissionsModifyAllRecords,
PermissionsRead,
PermissionsViewAllRecords
FROM ObjectPermissions
WHERE ParentId = : set1.id];
List<ObjectPermissions> oo1 = [SELECT ParentId,
Id,
SObjectType,
PermissionsCreate,
PermissionsDelete,
PermissionsEdit,
PermissionsModifyAllRecords,
PermissionsRead,
PermissionsViewAllRecords
FROM ObjectPermissions
WHERE ParentId = : set2.Id];
Map<String , ObjectPermissions> source_obj = new Map<String, ObjectPermissions>();
Map<String , ObjectPermissions> target_obj = new Map<String, ObjectPermissions>();
for (ObjectPermissions o : oo) {
source_obj.put(o.SObjectType, o);
}
for (ObjectPermissions o : oo1) {
target_obj.put(o.SObjectType, o);
}
ObjectPermissions target, source;
for (String s : source_obj.keySet() ) {
if (target_obj.containsKey(s)) {
target = target_obj.get(s);
source = source_obj.get(s);
System.debug('Source is:' + source);
System.debug('Target is : ' + target);
target.PermissionsCreate = source.PermissionsCreate;
target.PermissionsDelete = source.PermissionsDelete;
target.PermissionsEdit = source.PermissionsEdit;
target.PermissionsModifyAllRecords = source.PermissionsModifyAllRecords;
target.PermissionsRead = source.PermissionsRead;
target.PermissionsViewAllRecords = source.PermissionsViewAllRecords;
update target;
} else {
target = new ObjectPermissions(SObjectType = s );
source = source_obj.get(s);
target.PermissionsCreate = source.PermissionsCreate;
target.PermissionsDelete = source.PermissionsDelete;
target.PermissionsEdit = source.PermissionsEdit;
target.PermissionsModifyAllRecords = source.PermissionsModifyAllRecords;
target.PermissionsRead = source.PermissionsRead;
target.PermissionsViewAllRecords = source.PermissionsViewAllRecords;
insert target;
}
}
when the control come to this line
update target;
it is giving error
Update failed. First exception on row 0 with id 110i0000007KNEvAAO; first error: INVALID_CROSS_REFERENCE_KEY, You can't create, edit, or delete records for this permission set parent because it's associated with a profile. Parent ID: 0PSi00000009BE9: []
i am unable to figure it out why i am facing this error please some one help to resolve this error

Answer 1

the persmission set you are trying to update is already associated with some of your profile with id=0PSi00000009BE9
go to
https://ap1.salesforce.com/0PSi00000009BE9 and check there.