I am implementing a Custom Profile center. I tried to follow the method suggested by Adam here: Custom Profile/subscription center But get a 500 error when trying to load the page,

So, I further narrowed it down to the Cloudpagesurl Ampascript function example here:


And still get the error.

The Landing page contains only the following code, from the example in the documentation:


var @firstName
set @firstName = Lookup("Members", "First Name", "Subscriber Key", _subscriberKey)


<!DOCTYPE html>
      <h2>Hello %%=v(@firstName)=%%,</h2>
      <p>Welcome to your personalized landing page.</p>

What am I doing wrong?


The SFMC instance is new, MC Connect works as expected, and I have 3 email subscribers.

  • 2
    You're missing the opening "%%[" at the beginning of your AMPScript
    – Macca
    Apr 24, 2020 at 3:56
  • As Macca said, you are missing the opening %%[. You could also add some basic exception handling to still be able to display the CloudPage even if the data is missing: %%[ set @firstName = Lookup("Members", "First Name", "Subscriber Key", _subscriberKey) IF empty (@firstName) THEN SET @firstName = "Customer" ENDIF ]%%
    – zuzannamj
    Apr 24, 2020 at 9:29
  • You can also use an email to troubleshoot your ampscript. Simply hard code any requestparameter() values
    – EazyE
    Apr 24, 2020 at 13:31
  • @Macca thank you for jumping in on this. unfortunately I am missing it in the question only, not on the page - corrected the question. The issue is still unresoloved. Any idea?
    – LimeWeb
    Apr 24, 2020 at 17:59
  • @zuzannamj, thanks for your help. the %%[ was missing on the question only. What do you mean "the data is missing" how can subscriber key be missing from someone who got the email?
    – LimeWeb
    Apr 24, 2020 at 18:01

1 Answer 1


The answer is simply that Members (as appeared in the code from the documentation mentioned in the question) is not a Data Extension.

I thought Members was some kind of a Master Data Extension which holds all members. It's not.

Solution: Create 'Members', populate it. The code works.

Hopefully this saves someone time in the future. (Please Vote this answer up if it does).

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