I'm getting an error as trying to save edits in my custom component. 

I have another edit.php that works just well.

I identified that the problem lies in the table file, especifically in the function `check();`

When i have the function in my table file, whenever i save the edit, it gives me an SQL error:

>     `table_users` was not locked with LOCK TABLES`

when i take the function out, it gives me different error (The weirdest part is that even with the function not being there, it still says the function name):

    > Error Save failed with the following error: Invalid `parent_id` [0] in
    > PrefixNameTableTableName::check()

 the problem is that i don't need parent_id. How can i solve it? 

SOLVED:

1. Verify your table file. 
2. Make sure it's extending JTable and not JTableNested if you don't need parend_id
3.  Verify your class and table names
4. Make sure your database user has permissions.