if(r.hash=s.hash,r.version=s.spine,"3.8.75"==r.version)throw new Error("Unsupported skeleton data, please export with a newer version of Spine.")
"3.8.75"==r.version is throwing your error. The r.version is "3.8.99" in your new json file. So, "3.8.75" equals "3.8.99" is false.
The next issue is that you copied the owl demo which has blink, left, right, up, down animations; your json file does not have.