No minecraft forge/Clearing Cache problem

[martaluvschuu]

Title: No minecraft forge/Clearing Cache problem

Version: 3.1.2

OS: Windows

Java Version: 7 Update 7

Description of Problem:

I have my own server. I try to go on it but it says I don't have Minecraft Forge. I try to clear my cache and it doesn't work.

Error Messages:

Failed to clear the cache! Ensure Modpack files are open.

Error Log:

[martaluvschuu]

GUYs! i know how to fix it!! okay, go to options and switch to the recommended build. let it download and do whatever. then when youre on, try to go on the server, it wont work. get off, switch back to the latest build. say yes. then go on. it worked for me, i hope i helped somebody!