hi to all! i have installed android studio, my sdk path is
C:\ androidsdk\sdk\sdk . my android studio installed successfully.
but after installation when android studio opens then in
event log tab an error message appears: Grade sync failed:
Cause: failed to find target with hash string ' android-19'
in C:\androidsdk\sdk\sdk Consult IDE log for more details.
please guide me i will be thank full to u

What does the IDE log file tell you? Your post doesn't have enough information to help you.