I think i found out the solution (in my case, i able to solve it). It has some problem with this type of code in your web query :

include("...");
require("....");
require_once("....");

When i remove and modified the include file into the same file, the problem has been solve. hope it could help others.

Thank you to share the helpful information to us. This will help the others who meet the same issue.

I have been having the same problem with the get external data from the web returning no data.  Can you please explain your solution a little more?