What are the ImpossibleTechs?

Hi,

Upon checking the debug.err file after a crash, it has these messages of errors:

*DEBUG ERROR: ***Unable to find required tech ImpossibleTech for PirateShip. ***
Debug Message: Found existing ship type with class name: Ranger
*DEBUG ERROR: ***Unable to find required tech ImpossibleTech for Starbase. ***

Are these relevant or not, and what are these anyway?

Rgds
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