Problem with a variable

[WayTooShort]

I have an integer variable called "AInteger". After I used it on couple of triggers, I suddenly cannot choose it from the variable list. When I click and existing action using the variable, there is just an empty space where the variable should be.

Worst of all, when I try to re-create the variable it gives this error:
"A variable named 'AInteger' already exists.
This includes any variable which were deleted in the current Variables dialog."

How can I fix this? I already tried restarting the world editor.

 

[WolfieeifloW]

You must've accidentally deleted it somehow.
I'm not sure if there's a way to find it through maybe .j files, but you may just have to use a different name,