I am facing an issue with the Filter section of my custom Portlet. The Filter section consists of 4 attributes out of which 3 attributes are of browse look-up type (multi-select) and the fourth one is a text field. The text field gives proper results when filtered. However, for the 3 attributes of the browse look-up types (multi-select), I am not getting any results upon filtering. I also get the following error message:-
I tried using single-select browse look-up, but, in vain. This error is not occuring with any other custom Portlet. Any help with this would be very much appreciated.