Getting a similar error. The error code is different though.

Anycubic Mono X.
After slicing, and while saving the file, getting the following error.
Conversion failed!Error code:-1073741515

Using 1.8.1 on Win 10 Prof x64
Visual studio community 2019 is installed.

Looking for help.

上传的附件：

• Capture.PNG

Try this. It works for me. Missing certain .dll files.

https://forum.chitubox.com/?thread-765.htm