I tried to upgrade SLES 11 SP4 to SLES 12 SP1 or SP2 (same error....)

During the upgrade there is popup with error.

Installation of package libpango-1_0-0-32bit failed.

Subprocess failed. Error: RPM failed: /usr/bin/pango-querymodules: error
error: %preun(pango-32bit-1.26.2-1.3.1.x86_64) scriptled failed exit statu
error: pango-32bit-1.26.2-1.3.1.x86_64: erase failed
When I say ignore, it is not possible to start the server after upgrade; only the emergency logon is possible.
When I cancel upgrade at the popup I also have to recover to earlier state.

Any ideas what to do?

Thank you.