OK, I copied your compiler error message into an editor window and read it carefully:
One problem seems to be a mismatch cstring/string. I can remember that we tried to replace a cstring data type that was still necessary in out early listview related code with a plain Nim string, as Nim users generally like using real Nim strings better than cstrings. So you may try to locate the position of the error in your code and see if you are still using a cstring where you with gintro >= 0.8.0 should use a Nim string. I think we have updated indeed one of our shipped examples in such a way for 0.8.0, but I can not remember which one it was. So hopefully this is not a bug put some progression.
