Help. Server no longer works

Hi. I keep getting this error message when trying to boot up my groups server. Could someone help figure out whats happening and how to potentially fix it?

Yes it is a modded server.

09:37:47.9155 [FATAL] Initializer: System.InvalidOperationException: Collection was modified; enumeration operation may not execute.

at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)

at System.Collections.Generic.List`1.Enumerator.MoveNextRare()

at Sandbox.Game.Entities.MyCubeGrid.RemoveNPCBlocks(Boolean removeForConnectedGrids)

at Sandbox.Game.Entities.MyCubeGrid.RemoveNPCBlocks(Boolean removeForConnectedGrids)

at SpaceEngineers.Game.SessionComponents.MyNPCGridClaimSessionComponent.UpdateAfterSimulation()

at Patched_Sandbox.Game.World.MySessionUpdateComponents_0(Object )

at Patched_Sandbox.Game.World.MySessionUpdate_0(Object , MyTimeSpan )

at Sandbox.MySandboxGame.Update()

at Patched_Sandbox.Engine.Platform.GameUpdateInternal_0(Object )

at Patched_Sandbox.Engine.Platform.GameRunSingleFrame_0(Object )

at Patched_Sandbox.Engine.Platform.FixedLoop+<>c__DisplayClass11_0<Run>b__0_0(Object )

at Sandbox.Engine.Platform.GenericLoop.Run(VoidAction tickCallback)

at Sandbox.Engine.Platform.Game.RunLoop()

at Sandbox.MySandboxGame.Run(Boolean customRenderLoop, Action disposeSplashScreen)

at Torch.VRageGame.DoStart() in C:\ProgramData\Jenkins\.jenkins\workspace\Torch_master\Torch\VRageGame.cs:line 326

at Torch.VRageGame.Run() in C:\ProgramData\Jenkins\.jenkins\workspace\Torch_master\Torch\VRageGame.cs:line 126

at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

at System.Threading.ThreadHelper.ThreadStart()

System.InvalidOperationException: Collection was modified; enumeration operation may not execute.

at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)

at System.Collections.Generic.List`1.Enumerator.MoveNextRare()

at Sandbox.Game.Entities.MyCubeGrid.RemoveNPCBlocks(Boolean removeForConnectedGrids)

at Sandbox.Game.Entities.MyCubeGrid.RemoveNPCBlocks(Boolean removeForConnectedGrids)

at SpaceEngineers.Game.SessionComponents.MyNPCGridClaimSessionComponent.UpdateAfterSimulation()

at Patched_Sandbox.Game.World.MySessionUpdateComponents_0(Object )

at Patched_Sandbox.Game.World.MySessionUpdate_0(Object , MyTimeSpan )

at Sandbox.MySandboxGame.Update()

at Patched_Sandbox.Engine.Platform.GameUpdateInternal_0(Object )

at Patched_Sandbox.Engine.Platform.GameRunSingleFrame_0(Object )

at Patched_Sandbox.Engine.Platform.FixedLoop+<>c__DisplayClass11_0<Run>b__0_0(Object )

at Sandbox.Engine.Platform.GenericLoop.Run(VoidAction tickCallback)

at Sandbox.Engine.Platform.Game.RunLoop()

at Sandbox.MySandboxGame.Run(Boolean customRenderLoop, Action disposeSplashScreen)

at Torch.VRageGame.DoStart() in C:\ProgramData\Jenkins\.jenkins\workspace\Torch_master\Torch\VRageGame.cs:line 326

at Torch.VRageGame.Run() in C:\ProgramData\Jenkins\.jenkins\workspace\Torch_master\Torch\VRageGame.cs:line 126

at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

at System.Threading.ThreadHelper.ThreadStart()