I’m having a weird issue. “map” is a HashMap<L...

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[Ian]

I’m having a weird issue. “map” is a HashMap<Long, TreeSet<Transaction>>. “t” is a Long, yet when I try map.remove(t) I get an error:
Error:(43, 32) Kotlin: Type inference failed. The value of the type parameter K should be mentioned in input types (argument types, receiver type or expected type). Try to specify it explicitly.