JSON does not want to become JSON ;-)

bin/libbfa/__init__.py

@@ -386,6 +386,8 @@ class CompiledContract:
             where = json.loads(where)
         if (type(where) is dict) and 'abi' in where:
             where = where['abi']
+        if type(where) is str:
+            where = json.loads(where)
         return Abi(where)
 
     def instance(self, *args, **kwargs):