The four client error messages are:
Use of uninitialized value in unpack at /usr/share/perl5/IO/Multiplex.pm line 352.
Use of uninitialized value in numeric eq (==) at /usr/share/perl5/IO/Multiplex.pm line 352.
Use of uninitialized value in unpack at /usr/share/perl5/IO/Multiplex.pm line 352.
Use of uninitialized value in numeric eq (==) at /usr/share/perl5/IO/Multiplex.pm line 352.