Can't Get Length of Returned Table

[sls1005]

How about
    
    
    Error: `len(Table[string, string])' is not defined in this scope.
           Do you mean `proc len[A, B](t: Table[A, B]): int' defined in 
std/tables?
           If yes, please add the following code to the top of your source file:
               import std/tables
    
    Run