Domain rescalling ScaleSTL

hie there

i am having a problem, i am failing to rescale my stl file using scaleSTL. i first compiled the scaleSTL code and then obtained the executable file (.o) and then i used the propper syntax for rescalling and i keep getting an error.

Here is the syntax i am using:
$ mpirun -np 6 ./scaleSTL tpms.stl 0 0.00028 output.stl

The error that i am getting is:
mpirun was unable to launch the specified application as it could not access
or execute an executable:

Executable: ./scaleSTL
Node: lkadzungura-GL65-9SDK

while attempting to start process rank 0.

6 total processes failed to start

The executable file is actually there in the same folder i am working from and named scaleSTL.o.

please help