errors when synchronizing calendar

[bzfwunde]

Thanks for providing oczpush. I really want to use this, but unfortunately, I'm having trouble synchronizing my calendar. Every entry shows nicely in owncloud and synchronizes well through caldav, but when trying to synchronize it to my Nokia N8 I get a long list of errors in oczpush-error.log:

07/01/2013 07:43:03 [ 4568] [ERROR] [roland] TimezoneUtil::guessTZNameFromPHPName() no compatible timezone found for ''. Returning 'GMT Standard Time'. Please contact the Z-Push dev team.
07/01/2013 07:43:03 [ 4568] [ERROR] [roland] trace error: /share/HDA_DATA/oczpush/lib/default/diffbackend/exportchangesdiff.php:199 Creating default object from empty value (2048) - backtrace: 3 steps
07/01/2013 07:43:03 [ 4568] [ERROR] [roland] trace: 1:/share/HDA_DATA/oczpush/lib/request/sync.php:858 - ExportChangesDiff->Synchronize()
07/01/2013 07:43:03 [ 4568] [ERROR] [roland] trace: 2:/share/HDA_DATA/oczpush/lib/request/requestprocessor.php:127 - Sync->Handle()
07/01/2013 07:43:03 [ 4568] [ERROR] [roland] trace: 3:/share/HDA_DATA/oczpush/index.php:182 - RequestProcessor::HandleRequest()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace error: /share/HDA_DATA/oczpush/lib/utils/timezoneutil.php:1100 Object of class vtimezone could not be converted to string (4096) - backtrace: 5 steps
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace: 1:/share/HDA_DATA/oczpush/backend/occalendar.php:324 - TimezoneUtil::GetFullTZ()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace: 2:/share/HDA_DATA/oczpush/lib/default/diffbackend/exportchangesdiff.php:196 - BackendOCCalendar->GetMessage()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace: 3:/share/HDA_DATA/oczpush/lib/request/sync.php:858 - ExportChangesDiff->Synchronize()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace: 4:/share/HDA_DATA/oczpush/lib/request/requestprocessor.php:127 - Sync->Handle()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace: 5:/share/HDA_DATA/oczpush/index.php:182 - RequestProcessor::HandleRequest()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace error: /share/HDA_DATA/oczpush/lib/utils/timezoneutil.php:1198 Object of class vtimezone could not be converted to string (4096) - backtrace: 7 steps
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace: 1:/share/HDA_DATA/oczpush/lib/utils/timezoneutil.php:1198 - sprintf()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace: 2:/share/HDA_DATA/oczpush/lib/utils/timezoneutil.php:1102 - TimezoneUtil::guessTZNameFromPHPName()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace: 3:/share/HDA_DATA/oczpush/backend/occalendar.php:324 - TimezoneUtil::GetFullTZ()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace: 4:/share/HDA_DATA/oczpush/lib/default/diffbackend/exportchangesdiff.php:196 - BackendOCCalendar->GetMessage()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace: 5:/share/HDA_DATA/oczpush/lib/request/sync.php:858 - ExportChangesDiff->Synchronize()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace: 6:/share/HDA_DATA/oczpush/lib/request/requestprocessor.php:127 - Sync->Handle()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] trace: 7:/share/HDA_DATA/oczpush/index.php:182 - RequestProcessor::HandleRequest()
07/01/2013 07:43:06 [ 4470] [ERROR] [roland] TimezoneUtil::guessTZNameFromPHPName() no compatible timezone found for ''. Returning 'GMT Standard Time'. Please contact the Z-Push dev team.

Any help is greatly appreciated. I suspect that certain entries contain unsupported fields or data, and would be willing to fix those, if I could only figure out how to identify them.

Roland

(Contacts synchronize nicely.)