Probably a little late now, but I had the exact same error and for me the following helped:
In your docker toolbox installation folder, edit
Finalize step, there is a clear command (for version 1.12.2, it was in line 74). Comment that out:
cat << EOF
That’s where the startup was choking on. No idea, why.
Also, you might want to check if your export path is matching your installation location (line 8).