can’t retrieve entity config magento
This Error occurs basically due to config.php file’s Model setup
First of all check that table name and model name is correct in config.xml
Example :
<demo_resource>
<class>Demo_Model_Resource</class>
<entities>
<mymodel>
<table>table_name</table>
</mymodel>
</entities>
</demo_resource>
In the above example :
The model name and the table name should be correct .