PSEXEC - Multiple Instances - Returns Error Code 1?

I have configured 5 final builder projects, which will execute the batch file in 5 different remote machines. I have used the PSEXEC for this.

If I run one project at a times, it succeeds.

But If I run the 5 final builder projects at the same time, only one project succeeds, while the other projects returns the error code 1.

Can you guide me to solve the above issue ?