Simultaneous multichannel output and input using DAQ

Hello Community,

I am using NI 9263 (Analog Output Module) and NI 9229 (Analog Input Module) modeule to output and input signals. Both of them are 4 channeled. I want to output two same signals(its a combined pulse and triangular signal) simultaneously from two output channels (NI 9263) using labview, send them to A/D and record them(input them into labview) through NI 9229 Module. I kept on getting number of input tasks vs number of task to write error. Any suggestion to will be hignly apprecitated.