cannot upgrade 1.1.21 to 2.0.10?

[GeorgeHarrison]

I start upgrade file and after a few minutes get message Error!
Unknown Error!

phperrorlog says
Undefined index: database_error in ..../Sources/Subs-Db-mysql.php on line 594
PHP Fatal error:  Call to undefined function allowedTo() in /Sources/Subs-Db-mysql.php on line 595

If I try to run repair settings, I get the same errors -  Undefined index: database_error, PHP Fatal error:  Call to undefined function allowedTo() .

I am running php 5.3

I have searched the forums to try and find an answer but I am at a loss here in what to try next.

Any ideas?

Thanks

[Dzonny]

Hello there.

I'd say that you'd need to update your PHP version first, if possible, the one you're using is a way outdated.

[shawnb61]

I'd suggest a more recent version of SMF, also...  We're up to  2.0.17.