Bind Error in CFSELECT (from CFGRID)

All,

I am getting the following error msg:
error:bind: Bind failed for select box role_id, bind value is not a 2D array or valid serialized query.
Not sure how to fix this. Code below.

  <cfgrid name="linkGrid"  format="html" pageSize=5 sort=true selectcolor="##CCCCCC"
bind="cfc:InternalUsers.getInternalUsersList({cfgridpage},{cfgridpagesize},{cfgridsortcolumn},{cfgridsortdirection})">  
      <cfgridcolumn width="160" name="rol_role_name" header="Role">
      <cfgridcolumn name="ROL_ROLE_ID" display="no">
  </cfgrid>

<cfselect name="role_id" size="1"  bind="{linkGrid.ROL_ROLE_ID}">
<option value="0" >  --Select--  </option>
<cfoutput query="getRoles">
      <option value="#rol_role_id#">#rol_role_name#</option>
</cfoutput>
</cfselect>
If I check the bind value it shows correctly, but the item is not automatically selected from the drop down.

thanks