I cannot able to create a new Class in Unreal Editor,I cannot able to create another class in unreal editor

Hi All

I’m New to Unreal please help me with this issue for the past few days. The problem is I created a Actor called mine it has created a mine.cpp and mine.h. I cannot able to create Another Actor with a new name its saying it already exists please try a different name. I tried with other names also but still is not working please help me with this issue.
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