Widget Instances propeties missing in admin

[NickDave]

I'm currently running Magento CE 1.4.2.0 and have upgraded to 1.9 on a test server.
Everything seems to work except when in admin and clicking in to a "Widget Instance" the properties are missing.
An error shows in admin page source code in last line of html code below:-
"<b>Fatal error</b>: Class 'Mage_C3_V12finance_Helper_Data' not found in <b>/home/applianc/public_html/app/Mage.php</b> on line <b>547</b><br />"
Can anyone help or advise?

[Daniel Sousa · Accepted solution]

Hi NickDave,

Seems that you're using a extension named "V12finance".

1. Check if you have this file:

app/code/local/Mage/C3/V12finance/Helper/Data.php

This file should exist, if don't check with your extension provider.

2. If you are sure that you don't use that module go to app/etc/modules/C3_V12finance.xml and change:

<active>true</active>

to:

<active>false</active>

I hope this can help.

[NickDave]

Thanks I've disabled V12 extension and now my widgets have reappeared in admin will have to contact V12 for suppot.

Cheers!