Troubleshoot Aether Mod startup failures by checking version mismatches, dependencies, Java, memory and conflicting mods. This article keeps the process focused on file identity, compatibility, backups and controlled testing.
Read the earliest useful error
Open latest.log or the crash report and find the first specific message about a mod, dependency, Java class or version mismatch.
Remove duplicate and wrong-loader files
Keep only one Aether build and confirm every dependency belongs to the same loader family and Minecraft version.
Test a minimal profile
Launch with only the loader, required dependencies and Aether Mod. If this works, add other mods back in small groups.
Check memory and Java
Use a supported Java runtime and a reasonable memory allocation. More memory does not repair a version mismatch, so fix compatibility first.
Final checklist
- Record the exact Minecraft and loader versions.
- Keep a clean backup outside the active profile.
- Use only files intended for the selected environment.
- Test before opening important worlds.