[Solved]Can't launch any 1.7 modpacks

[Derpos4222222]

Title:

Can't launch any 1.7 modpacks​

Launcher Version:

1.4.8​

Modpack:

all 1.7 packs​

Modpack Version:

1.7.10​

Log Link:

http://paste.feed-the-beast.com/view/d46172c2​

Details of the issue:

Hello, I can't launch any 1.7.10 modpack, I've tried redownloading ftb, deleting the ftb folder, forcing update but nothing helped, please help ​

 

[Derpos4222222]

I forgot to add, as soon as I hit the launch button it just goes back to the launcher

 

[jikuja]

http://support.feed-the-beast.com/t...her-and-the-console-crashes/17165/16?u=jikuja

 

[Derpos4222222]

Can you guide me through this? I'm not a tech guy

edit: my english is pretty bad as well

 

[DiamondQ2]

The underlying problem is that the FTB launcher is attempting to upgrade / download the mod pack and it's failing.

Spoiler: Technical Details

When the pack is initially started, it contains an older version of the Google Guava libraries (likely 14.0 or 15.0). The pack attempts to connect to a website (cursecdn) to download the list of files to update (the 1.7.0.json file). The website wasn't working. The launcher then attempts to run without it. Unfortunately, the Forge Mod Loader (FML) was updated, and attempts to use some functionality from a newer version of the Guava libraries (originally provided in 16.0). Since that's not there (it's still running the old one), it fails.

This looks like a temporary failure of the Curse website, and most likely, if you just run it again, it should work.

However, you can try to bypass it by manually downloading the file http://ftb.cursecdn.com/FTB2/static/mcjsons/versions/1.7.10/1.7.10.json and copying it into your <ftb>/versions/1.7.10 folder (where <ftb> is wherever you've installed the FTB Launcher). The only problem with this process is that it still needs to download additional files, so if the cursecdn is still down, it's still going to fail, but just on the next file. However, it's possible that your copy has been corrupted, so this might fix it.

 

[Misora27]

I am having the same or a similar problem. I'm not sure how to open/edit a .json file or how to incorporate jikuja's solution link in order to change the version file.
In addition to this, I've been experiencing the highly annoying "Error downloading the assets" problem and have tried every fix I can think of, look up, or get my hands on, to no avail. The only work-around I've found is to literally disconnect from the internet and open the pack offline, then reconnect once Minecraft is loading in order to play the Regrowth pack with my husband on our server. I can't even do this if it keeps crashing back to the launcher before Minecraft can boot.

 

[Misora27]

Ah, ok, my Windows 8 was being silly. I figured out how to open the .json and change it (dunno why windows couldn't just clearly state you could use notepad. lol).
As for my other issues....

 

[jikuja]

The underlying problem is that the FTB launcher is attempting to upgrade / download the mod pack and it's failing.

Even more technical explanation: We are not yet sure if problem is caused by cloudflare blocking HEAD requests from IPs with high threat score or is the blocking done by ISPs'/governments' firewalls or is it users' firewall which is blocking HEAD requests. Anyway that's really stupid behaviour from firewalls to block HEAD request.

This problem is PITA to debug, almost impossible to reproduce by launcher team

 

[Derpos4222222]

Thanks guys, it worked love you guys sooo much <3