when i compiled button mouse control program,i got following error

when i compiled’ button mouse control 'program,i got following error as ‘Mouse’ not found. Does your sketch include the line ‘#include <Mouse.h>’? . but mouse library is already included . please give me solution to this.

Maybe the mouse is not in the library.

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[code] Paste sketch here. [/code]

What board do you have selected in the Tools > Board menu?