During link template processing, an attempt to operate on a permanent
     symbol will evoke one of the following:

     "Protected variable may not be deleted" <name>
     "Protected variable may not be modified"  <name>
     "Protected variable may not be replaced" <name>

     The following message indicates that link template processing could not
     be completed.  The "Use link template" box had been checked but no
     template had been provided.

     "Exception parameter" "Fatal error processing link template"