Call to undefined method plgVMPaymentBancoSabadell::convert_condition_amount()

[Jisas]

Hi,

I have installed my bank tpv extension but when enter to the cart appear next error:

Fatal error: Call to undefined method plgVMPaymentBancoSabadell::convert_condition_amount() in /usr/home/besttrail.cat/web/inscripcions/plugins/vmpayment/bancosabadell/bancosabadell.php on line 717 Fatal error: Access to undeclared static property: JLoader::$classes in /usr/home/besttrail.cat/web/inscripcions/libraries/loader.php on line 195

version:
Versión JOOMLA: Joomla! 2.5.16
Versión Virtuemart: Virtuemart 2.0.22c
PHP: 5.3

the version are right say me from my bank
why this error appears?What does it mean?

[jenkinhill]

I think you need to ask your payment plugin developer.

Your versions, Joomla VM and PHP are very old and insecure.  http://forum.virtuemart.net/index.php?topic=118683.0

[Jisas]

i ask them. thanks