No such file - This error code is returned instead of a task id when the pvmd fails to find a program executable during spawn.
Remember that task placement decisions are made before checking the existence of executables. If an executable is not installed on the selected host, PVM returns an error instead of trying another one. For example, if you have installed myprog on 4 hosts of a 7 host virtual machine, and spawn 7 instances of myprog with default placement, only 4 will succeed. Make sure executables are built for each architecture you're using, and installed in the correct directory. By default, PVM searches first in pvm3/bin/$PVM_ARCH (the pvmd default working directory is $HOME) and then in $PVM_ROOT/bin/$PVM_ARCH. This path list can be changed with host file option ep=. If your programs aren't on a filesystem shared between the hosts, you must copy them to each host manually.