I am getting an error when I try to use Exoside QuadRemesher and do not understand what is the cause.
Houdini version 19.5.493.

Have you found any solution to this?

If someone has similar problems: check your path in in QuadRemesher advanced setting -> Cache File. For some reason mine couldn't create sub-directories. So if it is something like:
${HIP}/geo/quad/name_QR_output.fbx
you need to make sure that there are "geo" folder and inside is "quad" folder.

After update to latest version of houdini (20.0.590)QuadRemesher stopped working. What helped:
In Terminal.app:
Type "chmod a+x ", drag&drop file xremesh, press enter.
/Users/Shared/Exoside/QuadRemesher/Datas_Houdini/QuadRemesherEngine_1.3/xremesh