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    Hi Václav / devs<br>
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              style="font-family:"Calibri",sans-serif;color:black">I
              am running r.forestfrag in Windows 10, grass 7.6.2
              Computation with a moving window size of 21 (but at
              another computer same happens at size 9) gives met the
              following error:<br>
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          <div>C:\Users\brp\AppData\Roaming\GRASS7\addons/scripts/r.forestfrag.py
            input=groenreclass@landschap output=AAtest7 size=21<br>
            Step 1: Computing Pf values...<br>
            Step 2: Computing Pff values...<br>
            WARNING: ZSTD compression error -14: Unsupported frame
            parameter<br>
            ERROR: Error uncompressing raster data for row 328 of
            <tmpA04_398bad3c_32a8_4220_8566_374c8c9f16a8><br>
            WARNING: No data base element files found<br>
            Traceback (most recent call last):<br>
              File
            "C:\Users\brp\AppData\Roaming\GRASS7\addons/scripts/r.forestfrag.py",
            line 420, in <module>     sys.exit(main(*gs.parser()))<br>
              File
            "C:\Users\brp\AppData\Roaming\GRASS7\addons/scripts/r.forestfrag.py",
            line 290, in main     ipl=ipl, tmpl4=expr1, tmpl5=expr2,
            pff=pff)<br>
              File
            "C:\OSGEO4~1\apps\grass\grass76\etc\python\grass\script\raster.py",
            line 111, in mapcalc " with expression: %s") % e)<br>
              File
            "C:\OSGEO4~1\apps\grass\grass76\etc\python\grass\script\core.py",
            line 667, in fatal error(msg)<br>
              File
            "C:\OSGEO4~1\apps\grass\grass76\etc\python\grass\script\core.py",
            line 651, in error    message(msg, flag='e')<br>
              File
            "C:\OSGEO4~1\apps\grass\grass76\etc\python\grass\script\core.py",
            line 584, in message     run_command("g.message",
            flags=flag, message=msg, errors='ignore')<br>
              File
            "C:\OSGEO4~1\apps\grass\grass76\etc\python\grass\script\core.py",
            line 415, in run_command ps = start_command(*args, **kwargs)<br>
              File
            "C:\OSGEO4~1\apps\grass\grass76\etc\python\grass\script\core.py",
            line 382, in start_command<br>
                return Popen(args, **popts)<br>
              File
            "C:\OSGEO4~1\apps\grass\grass76\etc\python\grass\script\core.py",
            line 76, in __init__     subprocess.Popen.__init__(self,
            args, **kwargs)<br>
              File "C:\OSGEO4~1\apps\Python27\lib\subprocess.py", line
            390, in __init__ errread, errwrite)<br>
              File "C:\OSGEO4~1\apps\Python27\lib\subprocess.py", line
            640, in _execute_child startupinfo)<br>
            WindowsError: [Error 206] De bestandsnaam of -extensie is te
            lang<br>
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          <div>Any idea what may be the problem here?</div>
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          <div>Greetings,</div>
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          <div>Paulo<br>
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