Hello,

> im facing issue while running simple "Hello world command. im running it on
> online sever. Please help me facing this issue. I am attaching the
> screenshot for your reference.
>From the error message it seems the main executable is missing. Most
likely there are some errors shown earlier in the notebook.

You should try and re-run the part that reported an error, or, if that
does not help, start from scratch by deleting the full Cactus checkout
by executing these comnands in a new cell:

%%bash
rm -rf ~/Cactus

then start the notebook from scratch.

Yours,
Roland



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