IOError("Only one sequence found in %s file" " '%s'; check your alignment file for errors" %( parserType, filename ) )
UserError("'%s' is not a %s file" %( filename, parserType ) )
IOError, "Syntax error in %s file '%s': %s" %( parserType, filename, val )
IOError( "No such file: %s" % filename )
IOError( "Sequence '%s' differs in length from" " preceding sequences; check your alignment" " file for errors" % s.name )