Made errors for working outside of contexts clearer.

flask/globals.py

@@ -14,24 +14,41 @@ from functools import partial
 from werkzeug.local import LocalStack, LocalProxy
 
 
+_request_ctx_err_msg = '''\
+Working outside of request context.
+
+This typically means that you attempted to use functionality that needed
+an active HTTP request.  Consult the documentation on testing for
+information about how to avoid this problem.\
+'''
+_app_ctx_err_msg = '''\
+Working outside of application context.
+
+This typically means that you attempted to use functionality that needed
+to interface with the current application object in a way.  To solve
+this set up an application context with app.app_context().  See the
+documentation for more information.\
+'''
+
+
 def _lookup_req_object(name):
     top = _request_ctx_stack.top
     if top is None:
-        raise RuntimeError('working outside of request context')
+        raise RuntimeError(_request_ctx_err_msg)
     return getattr(top, name)
 
 
 def _lookup_app_object(name):
     top = _app_ctx_stack.top
     if top is None:
-        raise RuntimeError('working outside of application context')
+        raise RuntimeError(_app_ctx_err_msg)
     return getattr(top, name)
 
 
 def _find_app():
     top = _app_ctx_stack.top
     if top is None:
-        raise RuntimeError('working outside of application context')
+        raise RuntimeError(_app_ctx_err_msg)
     return top.app