CRM 2011 Filtered Subgrid Error

Hi

I cant get my head around this error.

I'm trying to filter a subgrids "Add existing..."-button. The relationship is a N:N and my code looks like this:

function addExistingFromSubGridCustom(params) 
{

    var relName = params.gridControl.getParameter("relName"),
        roleOrd = params.gridControl.getParameter("roleOrd"),
        viewId = "{1DFB2B35-B07C-44D1-868D-258DEEAB88E2}"; // a dummy view ID

    var customView = 
    {
        fetchXml: params.fetchXml,
        id: viewId,
        layoutXml: params.layoutXml,
        name: params.name,
        recordType: params.gridTypeCode,
        Type: 0
    };
         alert(relName);
        alert(roleOrd);
        alert(params.fetchXml);
        alert(params.layoutXml);
        alert(params.gridTypeCode);

    var lookupItems = LookupObjects(null, "multi", params.gridTypeCode, 0, null, "", null, null, null, null, null, null, viewId, [customView]);
    if (lookupItems && lookupItems.items.length > 0) 
    {
        AssociateObjects(crmFormSubmit.crmFormSubmitObjectType.value, crmFormSubmit.crmFormSubmitId.value, params.gridTypeCode, lookupItems, IsNull(roleOrd) || roleOrd == 2, "", relName);
    }
}

function addExistingCustomFilter(gridTypeCode, gridControl, primaryEntityName) 
{

    // Here you can specify for which entity the filter should be applied.
    // For example, filter only when you try to add an existing record to a client.
    // In the other cases, you will call the default method.

    //var primaryEntityName2  = "client";

//    if (primaryEntityName != "client") 
//    {
//        Mscrm.GridRibbonActions.addExistingFromSubGridStandard(gridTypeCode, gridControl);
//        return;
//    }

    //Get a lookup value
    var lookupItem = new Array();
    lookupItem = Xrm.Page.getAttribute("log_account").getValue();
    if (lookupItem != null) 
    {
        var guid = lookupItem[0].id;
        var name = lookupItem[0].name;
    }

    //Update the fetch that will be used by the grid.
    var fetch = '<fetch version="1.0" output-format="xml-platform" mapping="logical">' +
                '<entity name="contact">' +
                '<attribute name="contactid" />' +
                '<attribute name="telephone2" />' +
                '</entity>' +
                '</fetch>';
    // Add conditions to your fetch xml dynamically
    // Call the generic method with the rights arguments. 
    addExistingFromSubGridCustom({
        gridTypeCode: gridTypeCode,
        gridControl: gridControl,
        fetchXml: fetch,
        layoutXml: '<grid name="resultset" object='+gridTypeCode+'  jump="telephone2" select="1" icon="1" preview="1">' +
                '<row name="result" id="contactid">' +
                    '<cell name="telephone2" width="250"/>' +
                    '</row>' +
                '</grid>',
                name: 'Custom Search View'
    });
}

The FetchXML here is just to try something more simpler then what I want, but even here it gives me an error

I also changed the XML on the button as I suppose to:

<CommandDefinition Id="Mscrm.AddExistingRecordFromSubGridAssociated"><EnableRules><EnableRule Id="Mscrm.AppendToPrimary" /><EnableRule Id="Mscrm.EntityFormIsEnabled" /></EnableRules><DisplayRules><DisplayRule Id="Mscrm.AddExisting" /><DisplayRule Id="Mscrm.ShowForManyToManyGrids" /><DisplayRule Id="Mscrm.AppendToPrimary" /><DisplayRule Id="Mscrm.AppendSelected" /><DisplayRule Id="Mscrm.CanWriteSelected" /></DisplayRules><Actions><JavaScriptFunction FunctionName="addExistingCustomFilter" Library="$webresource:log_filteredsubgrid"><CrmParameter Value="SelectedEntityTypeCode" /><CrmParameter Value="SelectedControl" /><CrmParameter Value="PrimaryEntityTypeName" /></JavaScriptFunction></Actions></CommandDefinition>

Can anyone help me with what the problem could be?

I'm getting the error when I push the button. First it gives me an "Error has occurred" pop up and after that a "Record is unavailable"-popup.

I have tried to debug the javascript, and the error is this line:

var lookupItems = LookupObjects(null, "multi", params.gridTypeCode, 0, null, "", null, null, null, null, null, null, viewId, [customView]);