CPU utilization for a particular process

[ken gray]

what am i doing wrong here?
i keep getting "Error (RT) in CPU_Notice: failed"

Code:

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int hwnd=win("Crystal Reports")
int a b
rep
    a=(GetProcessCpuUsage(hwnd))
    5
    b=(GetProcessCpuUsage(hwnd))
    if a+b=0
        mes("Crystal Reports is done." "CPU Notice" "i")
        end

thanks