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Cannot run example #10

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@TernaryM01

I'm using WSL 2 Ubuntu 20.04 inside Windows 10. I have installed SoPlex, OSI, and Fast-Downward with LP support. I have tested my downward installation by finding some simple PDDL task and then running
./fast-downward.py problem.pddl task.pddl --search "astar(lmcut())"
The solver found a solution. So there isn't an issue with my downward installation.

I installed fast-downward (this repo Haskell interface) using cabal:
cabal install fast-downward
It installed version 0.2.1.0 (latest).

Then, I downloaded the Gripper.hs example from this repo, and deleted the line:
module FastDownward.Examples.Gripper where
I saved it, and compiled it with:
ghc -o Gripper Gripper.hs
It compiled successfully, so I ran it:
./Gripper

The only output is the error message:
Gripper: downward: createProcess: runInteractiveProcess: exec: inappropriate type (Not a directory)

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