"Error, missing Report Suite ID in AppMeasurement initialization" is displayed in Browser Console

Adobe Analytics is implemented on the website via DTM and use of Custom Code. 
When looking at the Developer Console in the browser, I can see the error: Error, missing Report Suite ID in AppMeasurement initialization.
In some instances, the image request can still be fired correctly.

• Adobe Analytics
• DTM

Using s = new AppMeasurement() to instantiate the s object causes this issue.

Do not use the "new AppMeasurement" instantiation method. We recommend using s_gi instead.

var s_account="INSERT-RSID-HERE"
var s=s_gi(s_account)