Hi Mathias,
Thank you for the detailed guide, yet I am sorry to inform that I keep getting the same error. I deleted everything old, and downloaded a fresh copy of MapDisto. As you said, it did place a 'MapDisto_workspace' folder in 'My Documents' inside which were the plugins. Then I made a 'MapDisto' folder in 'My Documents' and placed the MapDisto excel file inside this folder. After that, I imported the data, scanned it, and successfully exported it to addons as you suggested. However, after that, I ran into the error again when trying to make a linkage map.
If you have some time, I'd appreciate it if you could quickly look at my data (
download link) and see if it's the nature of my data that is causing this problem. My P1 is 0, P2 is 2, and missing -1; no heterozygotes. Thanks!