To answer here too why it does not work. I was able to recreate the same problem (error number).
Mistake visible in screenshot in proxifier is that fiddler was forced to go over fiddler via proxifier, because even tough it is told to go directly and that rule is properly prioritized in Proxifier, Fiddler already made its rules like it does always, in internet proxy settings. So there were double rules. Proxifier+Fiddler work perfectly for me: https://postimg.cc/fVPTdfBH