Hi especially Claudia and Jack,
HIP's code uses the exists() function which was introduced in gretl
2016a. Currently (0.5) it specifies gretl 1.10.0 instead. Please update
the addon.
I would also suggest to increase the version number to 1.0, given that
no bugs have been reported as far as I am aware. Or if you think there's
some urgently missing functionality, it would be good to mention it in
the help file I think. (Maybe it is already the case?)
thanks
sven