Rayleigh Benard 2D - OpenLB - Invalid Parameter

I am attempting to run the rayleigh_benard2D.exe in OLB 0.5r2 after it has been compiled. I have entered the following when in the correct directory:

$ ./rayleigh_benard2d.exe 1.7 1 50 100

It returns the following:

1.7 1
1.73845e-06 1.73845e-06
defining dynamics
starting simulation
Writing stats at time 0.
Writing Gif
Invalid Parameter - 600x300
Invalid Parameter - 600x300

Then the simulation stalls and does not proceed.

Any ideas how to get this to run?