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You need to click on "Errors" not the count
That will open the errors window
You can also directly click on "Transaction snapshots" and just filter for Errors
This can happen due to a variety of reasons
Out of the Box, AppDynamics will have limits set to ensure it does not do excessive snapshots, as this adds overhead to the application.
Most of the time you will not have a 1 to 1 ratio between Errors and snapshots, especially when the error rate is very high.
You will have to check what limits you have set, under Slow/Error Thresholds for the application, and there are options to increase the snapshot collection to be more aggressive, however it will add additional overhead to the system.
You need to finely balance the overhead AppDynamics puts on the application to how many snapshots it collects when errors occur or slow transactions happen.
In summary AppDynamics will monitor and report on every error, but not take a snapshot for every error(on low error rates it will mostly take a snapshot for every error).
You can then use the Exceptions & Error screens to zone in on the errors being seen.
You can also use the Dashboarding side to report on types of errors etc.
Hope this clears things up