Multichannel Analog outputs synchronization error 50103

Hello,

I am trying to generate two analog signals from two different channels of my USB X series 6353. I am using an external digital trigger form one of the PFI0 to trigger the outputs. At the moment I am continuously encountering error 50013 (specified resource is reserved). I looked in NI help for the issue and made suggested changes but problem still exists.

I have attached my VI for further investigation.

NOTE: While running individually, the analog output works fine.