[SL] Upgrade dataset error

[Reverso <re...@o2...>]

I'm trying upgrade backup of my accounting data (I don't remember SL
version) to the latest version (2.8.20)

Routine:
1. run admin.pl and log in
2. select my Pg Database Administration
3. insert database data and click Update Dataset
4. select my dataset and click Continue
5. got Internal Server Error

There is relevant apache error.log below:

Undefined subroutine &main:: called at bin/mozilla/admin.pl line 1257., 
referer: http://omnibook/sql-ledger/admin.pl
Compilation failed in require at /usr/share/sql-ledger/admin.pl line 
85., referer: http://omnibook/sql-ledger/admin.pl
Premature end of script headers: admin.pl, referer: 
http://omnibook/sql-ledger/admin.pl

I try on another system (mac). The result is the same.

Undefined subroutine &main:: called at bin/mozilla/admin.pl line 1256., 
referer: http://localhost/sql-ledger/admin.pl
Compilation failed in require at 
/Library/WebServer/Documents/sql-ledger/admin.pl line 84., referer: 
http://localhost/sql-ledger
/admin.pl
Premature end of script headers: admin.pl, referer: 
http://localhost/sql-ledger/admin.pl

Any ideas how to cope with that?