Update src/phase/utils/phase_io.py

Co-authored-by: Rohan Chaturvedi <rohan.chaturvedi@protonmail.com>

Author: nimish-ks

src/phase/utils/phase_io.py

@@ -51,7 +51,7 @@ def __init__(self, init=True, pss=None, host=None):
 
         # Check if app_secret is None
         if app_secret is None:
-            raise ValueError("Phase token (pss) cannot be None")
+            raise ValueError("Phase token (pss) is missing")
 
         # Determine the type of the token (service token or user token)
         self.is_service_token = pss_service_pattern.match(app_secret) is not None