Umbraco 7 upgrade blank screen: unexpected token >
We are attempting to upgrade an umbraco 7.2.8 site to umbraco 7.5.8. When I load the backoffice to get a hold of the upgrade wizard, I am presented with a blank screen. When I inspect element, I see this: Uncaught SyntaxError: Unexpected token <. The reference to the error is: /umbraco/Application?umb__rnd=ffffffffb6d9a809.
Has anyone seen this error during an upgrade?
I figured it out. I navigated to the Sources tab of the chrome dev tools and found the Application?umb__rnd. I attached a screenshot of what I saw. It looks like there is some problem with ASP.NET Tracing set up on this site. I went to the web.config and found the configuration and set enabled=false. This solved my problem, and I was able to continue with the upgrade. I also found out that reenabling trace will break the backoffice even after the upgrade is complete. I will look into this more to find out if this is a problem specific to this umbraco site or if it is some sort of compatibility problem with ASP.NET Trace and Umbraco 7.5.8.
This was the problem:
<system.web>
<trace enabled="true" requestLimit="10" pageOutput="true" traceMode="SortByTime" localOnly="false" />
This is the clue I found in the chrome inspector:
