I am 100% sure that I have installed the Google Analytics tracking code successfully because when I visit the site where I installed it, I can see my visit as an online active user in the "REAL-TIME" section.
I am trying to use Google Experiments for split testing. I go to the "Experiments" section in Google Analytics:
I am configuring a new experiment and in the last step, when I try to validate my configuration by using the "Experiment Code Validation" option, I see this error: "No Google Analytics tracking code found."
The help Google provides, or hint to fix this error is: "Install Google Analytics tracking code on your experiment pages, then check them again.
We scan only the first 256KB of a page looking for scripts. If your code appears after the first 256KB, you see this error." My Google Analytics tracking code appears immediately after the <head> line in my code. Also, Google Analytics reports have been working correctly for me for months, reporting traffic and visits to my site. I do not understand why I get this "No Google Analytics tracking code found" error. See the error in the image below:
I found at https://developers.google.com/analytics/solutions/experiments-client-side this:
I simply ignored that error and moved on with my tests.