This error message usually appears when you (or another developer) are publishing the application while you are trying to open the page. Or it may happen when the url that you are using to access the page is old, e.g. you have changed the name of the page or the entry point.

Thanks @Vonnelize I will try it out and let you know.

Benj,

Did you checked the service center log?

Regards

-PJ-

Hey Guys sorry for the late response. I manage to fix this issue, the problem was I did not load the right theme.

@Pramod Thanks I manage to fix the issue by looking at the service center logs.

Benji,

Glad to hear that your problem has been resolved and you are always welcome for any queries\problem.

Regards

-PJ-

Thanks for letting us know! Happy that it is sorted now.

Hi Avneet,

You just need to go to the Service Center , you can access service center by

 https://yourid.outsystemscloud.com/ServiceCenter/ and inside it you will find different menus . Under the monitoring tab you can find logs for almost everything.

Regards,

-PJ-

Hey Guys I got this error as well but the service logs did not help me on this matter and I have permission issues because my companies lead is a nightmare who hogs all access and thinks he knows everything.

Anyways the solution for me was not the service center logs as I don't get access anyways! to that and I am the main developer on my project lol what a joke.

Solution:
So I added an expression to my header to display the user name.
And when I logged the user out. I got this error because it was
looking for the user details but the user details were not available
because I logged out the user. 

What I did is I wrapped the expression in an if statement and checked
if the user was logged in.
This stopped the expression from running when the user was logged out.

Tada! Fixed! :)
Hope this helps someone. 

There was no error to show me where the problem was 
and I had to dig through what I had built for a while. 
So if OutSystems could improve their error messages 
that would be great. 

Thanks.

Hi all,

Im completely new to anything related to programming and to Outsystems. Just instaled and started some lessons in Reactive Web Dev a couple of days ago. 

I was facing the same problem and in my case my it was really simple. I didnt had Chrome instaled!!! After I installed it, it opened the page without a problem. Im just posting this reply so anyone who may install Outsystems and face the same issue may remember to check this as well.

Cheers