create new orders does not work in magento

Question

I use Magento 1.7 , when i click to "create new orders", it shows error [see image below- Error 1]. Also when i click "view" to see my old orders which are pending it shows different error. [see image below- Error 2]

thanks in advance.

Answer 1

In the table eav_attributes find rows with the field backend_model equal to given model and temporary remove them or change the model to the name of the existing class.

for reference : invalid backend model specified