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### Instruction:
ISIS-4-ERR_EVM_ATT_FAIL
### Response:
(Severity: 4), (Category: ROUTING), (Description: IS-IS failed to register a handler for the specified class of event. This is an initialization error and implies that IS-IS will not be able to operate correctly. The IS-IS process must be restarted in order to recover. The cause may be a resource starvation problem but is most likely to be an internal programming error. The error message should give more details.), (Recommended Action: Reduce other system activity to ease memory demands. If conditions warrant, upgrade to a larger memory configuration.. Restart the IS-IS process. *RECUR*)
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