I am trying to add the pymodbus pacakge to the meta-python layer. I am not a Yocto expert but I am stumped on this error although I added the $ {PYTHON_PN}-six package. I would appreciate any help.

3.6.1 -> 3.6.9: just plugin the new version, no changes needed. 3.6.1 -> 3.7.0: Smaller changes to the pymodbus calls might be needed 2.5.4 -> 3.0.0: Major changes in the application might be needed ...