LDAP_SUCCESS" is not exported by the Net::LDAP::Constant

Hi, I tried to import some bugs via ./importxml.pl
some XML files worked fine, but some resulted in the error below.
What's wrong? (bugzilla-4.2.1)
Thanks, Juergen

./importxml.pl -v - v -v -v < bugs03.xml
"LDAP_SUCCESS" is not exported by the Net::LDAP::Constant module
 "LDAP_COMPARE_TRUE" is not exported by the Net::LDAP::Constant module
 "LDAP_COMPARE_FALSE" is not exported by the Net::LDAP::Constant module
Can't continue after import errors at lib/Net/LDAP/Message.pm line 7
BEGIN failed--compilation aborted at lib/Net/LDAP/Message.pm line 7,
<DATA> chunk 1.
Compilation failed in require at lib/Net/LDAP.pm line 13, <DATA> chunk 1.
BEGIN failed--compilation aborted at lib/Net/LDAP.pm line 13, <DATA> chunk 1.
Compilation failed in require at Bugzilla/Auth/Verify/LDAP.pm line 43,
<DATA> chunk 1.
BEGIN failed--compilation aborted at Bugzilla/Auth/Verify/LDAP.pm line
43, <DATA> chunk 1.
Compilation failed in require at Bugzilla/Auth/Verify/Stack.pm line
41, <DATA> chunk 1.
 at ./importxml.pl line 1272
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