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Error : Error: Call to undefined method Cezpdf::o_catalog()

Backtrace:
/modules/wfresource/class/pdf/class.ezpdf.php (676)
/modules/wfresource/class/class.dopdf.php (112)
/modules/wfchannel/class/class.page.php (685)
/modules/wfchannel/index.php (128)