XML : Error:(21, 76) error: cannot find symbol variable fab

when i get run on my application on android studio the following errors have appear:

  Error:(21, 76) error: cannot find symbol variable fab  Error:Execution failed for task ':app:compileDebugJavaWithJavac'.  > Compilation failed; see the compiler error output for details.    

i have a windows 8.1 and JDK-7u79 this question has no correct answer in the previous questions i need this answer.

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