Windows .exe Critical Tampering with minecraft Error

[RAMF]

• Operating System: windows 7 Home Premium 64-bit
• Java: version7_45 & versions7_51
• launcher version: version 1.3.4
• completed troubleshooting guide:Y
• Console log: http://pastebin.com/F2Jg1ygN http://pastebin.com/aQtknQdJ

Hello Forum

I have been using FTB Launcher for a while now and it wasnt till recently I have experience an error like this one.
I Recently updated my Launcher to the newest version. (v1.3.4) On both (4month)old and (2/13/14)new versions I am experiencing a **Critical Tampering with Minecraft error**, when FTB attempts to launch mod packs Direwolf and Horizons, but not mod packs such as Unleashed.

• I have updated java to its newest version.
• Removed and Deleted all folders of FTB (including the Roaming one)
• Reinstalled FTB from scratch.
• Copied folders from a friends working copy of FTB launcher.
• Reinstalled Vanilla copy of Minecraft in .minecraft folder.
• Force updated all installs on launch.

This is my Error report from one of my last tries using (java v7-45) http://pastebin.com/F2Jg1ygN and (Java v7-51) http://pastebin.com/aQtknQdJ

Lines .156-.158 include the Red text error ,and a problem of ClientBrandRetriever.class in the /FTB/versions/1.6.4/1.6.4.jar Also.

I am stumped to the cause to why and how this can be resolved.

 

[Tristam Izumi]

Couple of things.

[18:40:37] [ERROR] FileOutputStream.open:-2->Settings.save:73: Failed to save settings: java.io.FileNotFoundException: C:\Users\Ryan K\AppData\Roaming\ftblauncher\ftblaunch.cfg (The requested operation cannot be performed on a file with a user-mapped section open)

Try adding that folder to the exclusions for your antivirus.

2014-02-13 18:40:50 [SEVERE] [ForgeModLoader] A critical error occurred trying to read the minecraft jar file
java.io.FileNotFoundException: C:\Users\Ryan K\Documents\Mincraft [mods and manager]\Minecraft launcers\FTB\versions\1.6.4\1.6.4.jar (The system cannot find the path specified)

Spelling errors aside, I think the "[mods and manager]" part in the folder path is causing issues. If the antivirus thing above doesn't resolve the problem, try removing that from the folder path name and see if it helps.

 

[RAMF]

I found a few solutions to the problem from something in your post.

1. The antivirus has no effect on the file during or after its download.
2. The pathway is the issue due to a character not being visible to the launcher, using certain modpacks.

only when I moved the file back into that folder it caused the error.I noticed in the section you showed

• C:\Users\Ryan K\Documents\Mincraft [mods and manager]\Minecraft launcers\FTB\versions\1.6.4\1.6.4.jar

(yea i was always to lazy to fix those spelling mistakes) It was missing the character (+).

• C:\Users\Ryan K\Documents\Mincraft +[mods and manager]\Minecraft launcers\FTB\versions\1.6.4\1.6.4.jar

I removed the symbol from the pathway and the game started. Odd that it didn't make any difference before to Unleashed and other mod packs, from what I can tell maybe it does not effect Minecraft before version 1.6?

 

[techno156]

I suggest using an underscore for special characters like that, just in case they cause issues in future.