HTTrack 3.48.21 closed at '..\..\src\htscache.c', line 385
Reason: zip_zipWriteInFileInZip_failed

Stack trace:
PrintStack (c:\updatesw\httrack\src_win\winhttrack\crashreport.cpp:305)
[WinHTTrack]
CrashReportReport (c:\updatesw\httrack\src_win\winhttrack\crashreport.cpp:345)
[WinHTTrack]
httrackErrorCallback
(c:\updatesw\httrack\src_win\winhttrack\winhttrack.cpp:206) [WinHTTrack]
coucal_dec [libhttrack]
coucal_dec [libhttrack]
unknown
unknown
unknown
unknown

I am getting this error regularly all of a sudden; nothing has changed on the
machine or in configuration.  Possible issue could be?