Type mismatch. Expecting a� 'seq<string> -> 'a' �but given a� ''b list -> 'c list' �The type 'seq<string>' does not match the type ''a list'

Type mismatch. Expecting a� 'seq<string> -> 'a' �but given a� 'string list -> string list list' �The type 'seq<string>' does not match the type 'string list'

A unique overload for method 'Join' could not be determined based on type information prior to this program point. A type annotation may be needed.��Known types of arguments: string * 'a when 'a :> seq<'b>��Candidates:� - String.Join(separator: string,

Process completed with exit code 1.