Some times i want to play offline, because i have no internetconnetion aviable.
if i start the mod (i love it), it crashes.
i have tested to disable some included mod and i see that the mod modularsystem is the problem.
when i disable it i can play offline, when it is active then galactic science crashes.

Can you post the crash report found in the crash-reports folder?

https://gist.github.com/TengriTorok/edcc569d87873424f726
this happens on two different machines.
On both can i play, when i disable modularsystems

Thanks, I reported it to the mod author: TeamCoS/Modular-Systems#110
You can leave the mod out for now as it has another issue which will crash you if you use blocks from the mod.

Hi,
disabling Modularsystem has an effect to the scripts in the mod. an exemple: NEI shows no recipe for automaticsieve and i cant also craft one.
Minetweaker.log: https://gist.github.com/TengriTorok/dfc60410cee42e401e44

Probably because of the missing items, you would need to edit the scripts and remove all recipes which contains modular systems blocks/items.

Since I'm inexperienced with this sort of thing, would it be best to just wait until a fix is released? Or should I attempt to do the above?

You have to comment out with "//" only four or five lines in replacedRecipes.zs in the folder scipts.
search in the File for the section modularsystems and command every line there.
i have it done and it works for me.

So for every modular systems recipe in that file I should put //(modularsystemrecipe)// , or just put "//" around the entire section that mentions the modular systems? Cause doing the second option still denies me access to the autosieve recipe. And what file should I use to open it, will notepad do?

every line "in" the section //(modularsystemrecipe)//.
notepad isnt a good idea, because it open the File without linefeed. wordpad is a better choice.