VERY FREQUENT ERRORS DURING SAVING EMAILS

Stored 73.5%: slingss@gmail.com - Fwd: Invoice
Error: Error while saving e-mail
Ignoring this error message.
If you want, please report the following traceback at www.gmail-backup.com/forum
Thanks! (gmb.py revision 691):
Traceback (most recent call last):
File "gmb.pyo", line 1225, in backup
File "gmb.pyo", line 1119, in store
File "zipfile.pyo", line 615, in writestr
File "zipfile.pyo", line 536, in _writecheck
LargeZipFile: Zipfile size would require ZIP64 extensions