First of all, try to delete primary key (PK) one by one. When you remove first PK, try to use
statement on your table to check for errors. If it wasn't helpful, remove next PK, until success.
Warning: Please, be careful. Removing PK's, you can lose integrity of the data!!!
When you successfully fetch data, try to restore PK's and - also one by one - again use
statement. By doing in this way, you can find the column which raises error
I can't give you an example query, because you did not provide enough information ;(