OptionsBoost_OCv156.5b

(Opencart version 1.5.6.1)
Receiving error below when trying to access any product, when I use file "options_boost_batch_copy.xml" from extension listed above "OptionsBoost_OCv156.5b":

Fatal error: Cannot redeclare ModelCatalogProduct::addBatchOptions() in /homepages/...../vqmod/vqcache/vq2-####_model_catalog_product.php on line 358.

Any help would be appreciated,
Ibparn

[SOLVED}.... It was a vqmod "brands.xml" that was causing the error. After I removed it all works fine..

Thanks,
ibparn