type

NotImmutableErr

src const class NotImmutableErr : Err

NotImmutableErr indicates using a mutable Obj where an immutable Obj is required. See Obj.isImmutable for the definition of immutability.

make	Construct with specified error message and optional root cause.

src new make(Str msg := "", Err? cause := null)

Construct with specified error message and optional root cause.