I’m on my page I click top blackbar X -> edit page and then I get error:
A conflict on the front end of your site has prevented the preview from loading.
Here is picture from Chrome console
Hello There,
Thanks for writing in! A conflict on the front end could mean several things. There could be a JS error on the page. Please make sure that all your custom JS code is valid and correct. If it is not, it might create an issue because of the result of the JS error. A JS error from a 3rd party plugin may also be a caused of the issue. You could test for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
Please let us know how it goes.
If you have inserted custom html on the page especially iframe codes, please make sure that it is properly closed. It might messed up the Cornerstone preview or even the live page. It can also be because of your preview timed out. Please make sure that you have enough PHP memory limit. PHP memory limit exhaustion may lead to a timed out or even a fatal error. And lastly, please make sure that X FrameOptions is permitted in your server. Cornerstone preview is using iframes and if X FrameOptions is denied then this will display an error message.
Hope this helps.