I am attempting to install optifine for minecraft 1.14.2 (the preview version), and whenever I try to run the .jar file, it does this.
I have the newest version of java, and I have all the old ones uninstalled. Any help?
report issues with optifine preview not working to optifine so they can fix them for the release version
No, it happens with every single optifine version. Not just that one.