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Thank you for the great software.
Unfortunately, I have met the following Xwindow errors just after completion of scan.
The GUI is gone then.
(After running rtlsdr_scan.py, GUI screen comes and click start button can start scanning.)

"rtlsdr_scan_diag.py" works fine and "pyrtlsdr/test.py" describes good figure.

I would really appreciate any suggestions. Tks. Ark from Japan
----------------------------------Console---------------------------------------------------
~/work/sdr/RTLSDR-Scanner/src$ python rtlsdr_scan.py

RTLSDR Scanner

Found Rafael Micro R820T tuner
Found Rafael Micro R820T tuner
Found Rafael Micro R820T tuner
Exact sample rate is: 2000000.052982 Hz

The program 'python' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadPixmap (invalid Pixmap parameter)'.
(Details: serial 12883 error_code 4 request_code 54 minor_code 0)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the --sync command line
option to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
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There are different errors from time to time such as
The error was 'BadRequest (invalid request code or no such operation)'.
The error was 'BadIDChoice (invalid resource ID chosen for this connection)'.