Board Thread:Questions and Answers/@comment-212.40.141.2-20140330155330/@comment-1757231-20140402141522

212.40.141.2 wrote: Can u please tell me precisely step by step how to fix id conflicts? When Minecraft says "ID Conflicts found", it'll create a file called IDConflicts.txt in your .minecraft folder. Click on that, and it'll tell you what the conlficts are, from which mods, and what ids they are. Then, got to the config file of the mod(s) which are violating the id conflicts, and change those IDs to the "suggested values" in the IDConflicts.txt

Alternatively, download the idfix mod.

In 1.7, this will no longer be an issue. Yay!