Tekkit Crashing in multiplayer

[BambiLamb]

When i try to join my friends private server i move my mouse a tiny bit and it crashes

we are playing tekkit with a few extra mods me and my friends added we have the portal gun mod, AdvancedSolarPanels, Railcraft, IC2NuclearControl and PC_PowerConverters

 

[Curunir]

Issues go on the issue tracker, and try following the template.

Although the standard answer is, restore Tekkit to its default configuration without those mods you added. If it ceases to crash, your modifications are the problem, and your friends need to do the tech support.

[BambiLamb]

how does one do this