Well, if you have edited your table in SE11 and now the error is there while activating it then don't panic.
Just go to SE14 Tcode and from there Activate and adjust the table. Now, once you are done, go back to SE11 and check your table. Now, it should be activated with all the modifications you have done.
It is a quick-fix solution if you are stuck.
Happy Learning!
Dr. Tech