MOD_ERROR: Modular Encounters Spawner, in file:
Compilation of C:\Users\#REDACTED#\AppData\Roaming\SpaceEngineers\Mods\1521905890.sbm_ModularEncountersSpawner failed:

MOD_ERROR: Modular Encounters Spawner, in file:
E:\Games\Steam\steamapps\workshop\content\244850\1521905890\Data\Scripts\ModularEncountersSpawner\NPCShieldManager.cs(153,16): Error: The name 'GridUtilities' does not exist in the current context

MOD_ERROR: Modular Encounters Spawner, in file:
E:\Games\Steam\steamapps\workshop\content\244850\1521905890\Data\Scripts\ModularEncountersSpawner\NPCShieldManager.cs(155,25): Error: foreach statement cannot operate on variables of type '?' because '?' does not contain a public instance definition for 'GetEnumerator'

MOD_ERROR: Modular Encounters Spawner, in file:
E:\Games\Steam\steamapps\workshop\content\244850\1521905890\Data\Scripts\ModularEncountersSpawner\GridBuilderManipulation.cs(1004,25): Error: The name 'RandomNameGenerator' does not exist in the current context

It looks to me like certain variables just don't exist anymore, breaking spawning.

EDIT:

After deleting and re-downloading all my mods, it has started working properly.