You trie to tie a variable to an empty class. You haven't shown the code, but likely, line 78 looks like:

tie %foo, '', ...
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tie %foo, $bar, ... # and $bar is empty
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So you will now have to find out why you're trying to tie something to the empty class (the main program). Likely, you're just missing the tie-class parameter in that line.

You don't give us much to go on here. How (Not) To Ask A Question

Guessing from the directory name /perlfect/ and a little Google... Is this file ".../perlfect/search.pl" from the http://www.perlfect.com/freescripts/search/ source code?

Here are lines 77 and 78 of search.pl. I'd guess $db_package is blank and you have a configuration problem.

tie %inv_index_db, $db_package, $INV_INDEX_DB_FILE, O_RDONLY, 0755 or 
+die "Cannot open $INV_INDEX_DB_FILE: $!";   
tie %docs_db,      $db_package, $DOCS_DB_FILE, O_RDONLY, 0755 or die "
+Cannot open $DOCS_DB_FILE: $!";
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yes correct. where should i look for to solve this problem. how can i solve the problem? Thank you all for your helpp! regards John

Is it possible that you do not have DB_File installed? Or you've configured for some other database module that is not installed?

look on line 78 to see which hash you're trying to tie