Android Question Error:Access to the path 'C:\Users\saeed\Dropbox\My_Android_PROG_NEW\MyClock\Objects\classes.dex' is denied.


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When I compile program it gives the error
Access to the path 'C:\Users\saeed\Dropbox\My_Android_PROG_NEW\MyClock\Objects\classes.dex' is denied.
I try to restart computer same error
I try to previously complied without error same error is coming please help me.
I do not know but I try to install SDK manager may be due to this please help me thanks in advance