GetLocalizedMessage returns the localized error message Parameters: - code: the error code - lang: the language code Returns: - string: the localized error message.

InitLogFile initializes the log file Parameters: - logFilePath: the path to the log file Returns: - error: an error if the log file could not be initialized, otherwise nil.

LogError logs the error to both file and console Parameters: - err: the error to log.

NewAggregateError creates a new AggregateError Parameters: - errors: the list of errors to aggregate Returns: - *AggregateError: the new AggregateError.

NewError creates a new custom error Parameters: - code: the error code - message: the error message - level: the error level - context: the context information - original: the original error Returns: - *CustomError: the new custom error.

NotifyError sends an error notification (example: send email) Parameters: - err: the error to notify about - recipientEmail: the recipient email address.

RegisterErrorHandler registers a custom error handler Parameters: - handler: the custom error handler to register.

TriggerCustomErrorHandlers triggers all registered custom error handlers Parameters: - err: the error to handle.

Unwrap unwraps an error to get the original error Parameters: - err: the wrapped error Returns: - error: the original error.

Wrap wraps an error with an additional message Parameters: - err: the original error - message: the additional message Returns: - error: the wrapped error.

Define common error types.

Define common error types.

Define common error types.

Define common error types.

AggregateError aggregates multiple errors into one.

CustomError represents a custom error type.

ErrorHandler is an interface for custom error handlers.

ErrorLevel represents the severity level of an error.