Fatal Error when loading world from launch

[WolfX1]

I apologize to the admins if this is not the right forum.

As the title says, I made a [1.7.10] custom modpack, and when I start up the launcher and enter the map, it hangs for a few seconds, or until I try clicking on the screen. Then it crashes to the main menu. Here is the weird thing. If I try to enter the map again, it loads up as intended.

Here is a pasteEE log (the same one from the video): https://paste.ee/p/jz6NN
[mods] https://paste.ee/p/jz6NN#s=0&l=73
[RAM]  -Xms5000m, -Xmx17000m
[SPECS]

• Intel Core i7-4790K 4.0GHz 
• Asus Z97-A ATX 
• Kingston HyperX Fury Black 28GB Memory 
• EVGA GeForce GTX 970 4GB SSC 
• 750W 80+ Gold Certified PSU 
• Windows 10 64bit

My (H:) is the fastest non SSD I have running. 

I hand downloaded every mod (and checked if they are in beta or not). The [questionable] mods were one I were not sure if they would work. I got this list when trying to update Tekkit 1.6.4 (from the official launcher). 

 

[VIDEO] https://youtu.be/5Swj7OBcd5E

EDIT: How do I remove that annoying highlight?

Edit 2: This has been happening since I first started playing this modpack. Like #FirstRenderProblems. Even though I have a huge chunk anchor, I had just put that in last night.

Edited August 28, 2017 by WolfX1
Trying to remove annyoing highlights

[JaariAtmc]

This is caused by using the wrong launcher. (Really? You coming here for support for MultiMC?)

[Torezu]

Not relevant topic - we do not support MultiMC, for obvious reasons.  Locked.