Thanks Jonathan. I had installed the module, that was not the problem (otherwise the problem would not come and go, would it?). For instance this still happens after installing: Name : perl-Date-Manip Arch : noarch Version : 6.59 Release : 1.fc25 (on fedora 25 with koha 17.05) ---- ERROR LOADING MODULE: Date::Manip::DM6 at /usr/share/perl5/vendor_perl/Date/Manip.pm line 34. Compilation failed in require at /usr/share/perl5/vendor_perl/C4/Overdues.pm line 25. BEGIN failed--compilation aborted at /usr/share/perl5/vendor_perl/C4/Overdues.pm line 25. Compilation failed in require at /usr/share/perl5/vendor_perl/C4/Members.pm line 30. BEGIN failed--compilation aborted at /usr/share/perl5/vendor_perl/C4/Members.pm line 30. Compilation failed in require at /usr/share/perl5/vendor_perl/C4/Reserves.pm line 28. BEGIN failed--compilation aborted at /usr/share/perl5/vendor_perl/C4/Reserves.pm line 28. Compilation failed in require at /usr/share/perl5/vendor_perl/C4/Circulation.pm line 28. BEGIN failed--compilation aborted at /usr/share/perl5/vendor_perl/C4/Circulation.pm line 28. Compilation failed in require at /usr/share/perl5/vendor_perl/C4/XSLT.pm line 30. BEGIN failed--compilation aborted at /usr/share/perl5/vendor_perl/C4/XSLT.pm line 30. Compilation failed in require at /usr/share/perl5/vendor_perl/C4/Search.pm line 29. BEGIN failed--compilation aborted at /usr/share/perl5/vendor_perl/C4/Search.pm line 29. Compilation failed in require at /usr/share/perl5/vendor_perl/C4/AuthoritiesMarc.pm line 25. BEGIN failed--compilation aborted at /usr/share/perl5/vendor_perl/C4/AuthoritiesMarc.pm line 25. Compilation failed in require at /usr/share/perl5/vendor_perl/C4/ImportBatch.pm line 28. BEGIN failed--compilation aborted at /usr/share/perl5/vendor_perl/C4/ImportBatch.pm line 28. Compilation failed in require at /usr/share/koha/intranet/cgi-bin/tools/stage-marc-import.pl line 40. BEGIN failed--compilation aborted at /usr/share/koha/intranet/cgi-bin/tools/stage-marc-import.pl line 40. ---- But it disappeared after installing the next version from CPAN: ---- # cpanm Date::Manip --> Working on Date::Manip Fetching http://www.cpan.org/authors/id/S/SB/SBECK/Date-Manip-6.60.tar.gz ... OK Configuring Date-Manip-6.60 ... OK ==> Found dependencies: Test::Inter --> Working on Test::Inter Fetching http://www.cpan.org/authors/id/S/SB/SBECK/Test-Inter-1.06.tar.gz ... OK Configuring Test-Inter-1.06 ... OK Building and testing Test-Inter-1.06 ... OK Successfully installed Test-Inter-1.06 Building and testing Date-Manip-6.60 ... OK Successfully installed Date-Manip-6.60 (upgraded from 6.59) 2 distributions installed ---- Let's see if the error still comes and go. Federico