no payment method is accepting in virtuemart 2.0.20b

[proventures]

Hi,
  We are using Joomla 2.5.6 and virtuemart 2.0.20b. When are unable to save any payment method.
we select any payment method and click save button it shows blank page. The attach is the plugin for payment method for CCAvenue.

Please help
Regards,
Proventures

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