Software error:

contriblist.tmpl: undef error - DBD::mysql::st execute failed: Got error 28 from storage engine [for Statement "(select *, surname as orderthis
                 from author
                where surname like ?)
               union
               (select *, exsorder as orderthis
                 from author 
                where exsorder like ? and surname not like ?)
               order by orderthis" with ParamValues: 0='Z%', 1='Z%', 2='Z%'] at ../lib/perl5/Swan/Database.pm line 123.

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