Double click error

When I double click on any file name or type I get an error. OPENing the file from the right click menu works OK. How do I fix this? The error is something like:

An error occurred making link "go":
An unknown error occurred.

Thanks for your help.

Go to Settings -> File Types -> All Files -> Events.

If anything is assigned to Left double-click, delete it.

Do the same with the All files and folders file type.

(Do not do the same to the All folders file type, which is supposed to have a command on the left double-click event.)