Navigation function not working.

Hi,

I am trying to show a mash up as a pop up when user clicks on a button using Navigation function.

I have entered the target mashup, Target window type -- Modal popup and other required details. When I clicked on the button, I can see a pop up but the pop is empty. I am not able to see the mashup I gave as target and the pop up is empty. I followed the below link for reference.

https://support.ptc.com/help/thingworx_hc/thingworx_8_hc/en/index.html#page/ThingWorx%2FHelp%2FMashup_Builder%2FFunctions%2FNavigation.html%23

Please help me to move forward.

Thanks,