Error 7 in real time host interfacing FPGA

Hi all,

I have a simple problem with my data logging. Error 7 is happening when I try to write my data to a text file. However this does not happens if I use the same code with simulated data outside of my FPGA project (inside a simple VI). So I suppose there is one trick when using FPGA reference which has to be compiled?

Thank you for your help,

Tamara