Starting with Resilio Connect 2.9 and above, it is now possible to ignore error messages.
If there's an error on a job, job run or an Agent, it is now possible to ignore it. Click on the errors and select the one that you want to ignore. Only one error message can be selected at a time. Note, it's the error message that is ignored. It means that if several agents have the same error message, it's sufficient to select it for at least one agent and click "Ignore the error", and it will be ignored for all other agents in all other jobs.
The error message will be ignored for the job, its all currently active runs and next runs. If this error appears on an already competed (failed / aborted) job run the error will remain there. That also means that if the error is "un-ignored", it won't re-appear on finished job runs. It's so because a finished job run is a kind of a snapshot and cannot be changed at all.
Do not ignore the error message that you're not sure about and that might be critical for you to identify that the job run has stuck. Mail notification is not sent for the ignored errors as well.
Starting with Resilio Connect v3.2.1 it's possible to add exceptions for a Job or an Agent. It can be done from the error message itself by clicking to ignore an error...
...or from MC Settings -> Notifications -> Ignored errors. 
The ignored errors and exceptions appear in column Settings -> Notifications- Ignored errors . The error is ignored for the selected Agents and the selected jobs. In the example above for the exception list of AgentA and AgentB, and Job1:
- Agents A and B will show error (= not ignore) for all their jobs;
- All agents in Job1 will show error (=not ignore)
The Errors are listed by error codes. Refer to the table below for the most popular error codes. This list is not full though. If you encounter some error messages that you need help with, please contact support.
It's highly not advisable to ignore error code "SE_OPERATION_ABORTED".