google is your friend
I took the last line of the error-message and googled
https://www.google.de/search?as_q=File+"serial\serialwin32.py"%2C+line+325%2C+in+write+serial.serialutil.SerialTimeoutException%3A+Write+timeout
These two links seem to be promising
More information is required
Post your complete sketch as a Code-Section
Post the complete compiler-output as a Code-Section
best regards Stefan
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