Custom Multifield is not working In AEM 6.3

This is very vague.

This is also the reason you don't implement custom multifields, because the API's are constantly changing.

Custom Multifield is not working in AEM 6.3?

What error in the browser are you seeing?

I am seeing an error too in 6.3. This works in 6.2. I am investigating. It may be a bug.

Uncaught RangeError: Maximum call stack size exceeded

    at instanceGenerator._addListeners (composite-multifield.7ad2e3d05f614dfeab0290e74ff2d9

I will post back my findings.

This typically happens because 2 xtypes have the same namespace and therefore AEM tries to load both.  I've seen this with ACS Commons installed (with their multifield panel) and also a custom multifield being installed.

seen error because we have customised the dialog, i have updated the customised dialog with 6.3 updates its started working.

Thanks.

i created custom multi field in touch ui AEM 6.3,but when i am trying to add fields i am getting error in console

Uncaught RangeError: Maximum call stack size exceeded.

Same here.

Uncaught RangeError: Maximum call stack size exceeded

    at f._addListeners (composite-multifield.min.js:59)

    at f._addListeners (composite-multifield.min.js:59)

    at f._addListeners (composite-multifield.min.js:59)

    at f._addListeners (composite-multifield.min.js:59)

    at f._addListeners (composite-multifield.min.js:59)

    at f._addListeners (composite-multifield.min.js:59)

    at f._addListeners (composite-multifield.min.js:59)

    at f._addListeners (composite-multifield.min.js:59)

    at f._addListeners (composite-multifield.min.js:59)

    at f._addListeners (composite-multifield.min.js:59)

In AEM 6.3, custom multi-field is available as part of coralUI.