Mac "There was a fatal error starting up minecraft and FML"

[UUmatter37]

This happened when i decided to try out a older version of ampz and then switch back to the new one. It tells me to look at a file for further info but i couldn't find it. The console says...

1. "2013-04-26 18:51:16 [SEVERE] [ForgeModLoader] This version of FML is built for Minecraft 1.4.7, we have detected Minecraft 1.4.6 in your minecraft jar file
2. 2013-04-26 18:51:16 [INFO] [STDOUT] A CRITICAL PROBLEM OCCURED INITIALIZING MINECRAFT - LIKELY YOU HAVE AN INCORRECT VERSION FOR THIS FML"
   I dont know how to fix this, please help...

 

[lavarthan]

Did you do a force update? A force update re-downloads all the mods and minecraft and starts from scratch. Could you post the entire error log to pastebin?

 

[UUmatter37]

Will that reset my saves? If yes, is there any way to preserve them?

 

[Booker The Geek]

It will not reset your saves... I think. You should always back them up first.

hint, there in the saves folder of the mod pack your using.

 

[UUmatter37]

its fixed... thank you. 1 more question, is there a way to get the dungeon pack mod working with the launcher? It doesn't load when i add it.

 

[lavarthan]

There should be, but we need the error log that it makes to fix it so it will. Follow the guide in Booker's signature to get it.

 

[UUmatter37]

Theres no crash, it just says "file already exists, cant add mod" it says that it is in the pack but when i load up a world its not there...

 

[lavarthan]

Is the mod disabled in the launcher? Is this a new world or an existing one? When you load minecraft, before you load any worlds, check that it is listed when you click the mods button.