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This event occurs when an external startup class throws an exception during function app initialization.
| Value | |
|---|---|
| Event ID | AZFD0005 |
| Severity | Error |
Event description
An external startup class is a class registered with the FunctionsStartupAttribute. It's often used to register services or configuration sources for dependency injection. For more information on the feature, see use dependency injection in .NET Azure Functions.
If a call to either of the Configure() methods on the FunctionsStartup class throws an exception, it causes the function app initialization to fail. The functions host catches this exception, logs the error, and retries initialization. This retry helps to recover from transient errors, but permanent errors might be logged many times as the host retries.
If APPLICATIONINSIGHTS_CONNECTION_STRING is set as an app setting, the error is also logged as an exception in Application Insights.
How to resolve the event
Every occurrence of this event is unique to the application. Investigate the error message and stack trace to see what can be done to prevent this error in the future. For example, a timeout might need to be retried; or an error calling an external service might need to be handled.
When to suppress the event
This event shouldn't be suppressed.