B4J Question Which library to use for HMAC-SHA256 - tried jB4XEncryption & B4XEncryption

I am trying to generate sign for an API using HMAC-SHA256
I have jB4XEncryption ticked but I still get 'unknown type error 'UNKNOWN TYPE ERROR
I also tried copying the B4XEncryption lib to the internal library folder of b4j but I still get the error:
B4X:
Sub GenerateSign(client_id As String, access_token As String, timestamp As String, secret As String) As String
    Dim key As String = secret
    Dim message As String = client_id & access_token & timestamp
    Dim m As Mac 'UNKNOWN TYPE ERROR
    Dim k As KeyGenerator 'UNKNOWN TYPE ERROR
 
Top