unable to add,edit,delete content types in drupal 7? I'm unable to add, edit, delete content types and content also in Drupal 7, the button links are not working. If I click add, edit, delete button below an error happens. What could be wrong here?
Try following steps. 


Make sure clean URLs working first. If you need any help for clean URL visit this link
Try clear cache and then disable all contributed modules. I see there is a problem due to commerce line items module. Disable all contributed modules. Don't disable core modules. 
Clear cache and check. 


Tell me in comments if you still face problem.