I have a toolbox with two models that I am trying to send to someone else. I am working in 10.4 and he is working in 10.3.
I save my toolbox as a 10.3 toolbox and send him the .tbx file, but when he loads the file the toolbox is blank. There is no drop-down button and no models in the toolbox. It is worth noting that when I try to open the 10.3 toolbox in my own project there is nothing there either.
What could be the problem?
Edit: To add to this, I can't share my results as a geoprocessing package either. I get an error that says
General function failure Error 999999: Error executing function.