[execution][local] Remove use of Prefix

beat/core/execution/local.py

@@ -63,8 +63,7 @@ class LocalExecutor(BaseExecutor):
 
     Parameters:
 
-      prefix (beat.backend.python.utils.Prefix): Establishes the prefix of
-        your installation.
+      prefix (str): Establishes the prefix of your installation.
 
       data (dict, str): The piece of data representing the block to be executed.
         It must validate against the schema defined for execution blocks. If a
@@ -256,7 +255,7 @@ class LocalExecutor(BaseExecutor):
             exc_type, exc_value, exc_traceback = sys.exc_info()
             tb = traceback.extract_tb(exc_traceback)
 
-            contributions_prefix = os.path.join(prefix.paths[0], contribution_kind) + os.sep
+            contributions_prefix = os.path.join(prefix, contribution_kind) + os.sep
 
             for first_line, line in enumerate(tb):
                 if line[0].startswith(contributions_prefix):