UiPath Exceptions: The Wild Ride of Automation Errors!

UiPath Exception Types & Descriptions

1. BusinessRuleException

  • Description: Thrown when a business rule or condition is violated during execution.

  • Commonly used to indicate expected errors that need special handling without breaking the automation.

  • Typically used in workflows with custom rules.

2. SystemException

  • Description: Represents system-level errors, including issues with resources or operating system failures.

  • Typically causes a workflow to terminate unexpectedly.

  • Occurs in scenarios like memory issues or unavailable resources.

3. ApplicationException

  • Description: Thrown when an error occurs due to application logic, such as invalid user inputs or incorrect system interactions.

  • Can be custom-defined to reflect specific errors.

  • Helps handle errors that don’t fall into the system-level exceptions.

4. NullReferenceException

  • Description: Occurs when trying to access a null object or variable.

  • One of the most common errors when dealing with uninitialized variables.

  • Requires careful checks for null values before use.

5. IndexOutOfRangeException

  • Description: Raised when attempting to access an index outside the valid range of an array or collection.

  • Happens when a program tries to reference an invalid index (e.g., accessing index 5 in a 3-item array).

  • Can be handled by validating the index before access.

6. InvalidCastException

  • Description: Thrown when an invalid type conversion is attempted.

  • Commonly seen when trying to cast an object to an incompatible type.

  • Ensure data types are compatible before casting to avoid this exception.

7. FileNotFoundException

  • Description: Triggered when a specified file cannot be found during operations.

  • Often occurs during file read or write activities.

  • Ensure the file exists or the correct path is specified.

8. DirectoryNotFoundException

  • Description: Raised when a specified directory path is not found.

  • Common when accessing directories that do not exist or were incorrectly typed.

  • Double-check directory paths or create directories before using them.

9. UnauthorizedAccessException

  • Description: Occurs when the system doesn’t have permission to access a file or directory.

  • Happens when dealing with restricted files or directories.

  • Requires appropriate permission settings or using elevated privileges.

10. TimeoutException

  • Description: Thrown when an operation exceeds the specified timeout duration.

  • Seen in scenarios like waiting for an element that doesn’t appear within the expected time.

  • Can be managed by adjusting timeout settings or retrying.

11. ElementNotFoundException

  • Description: Raised when UiPath is unable to locate a UI element based on the given selector.

  • Occurs when selectors change dynamically or an element is no longer present.

  • Revisit selectors or use "Find Element" to confirm visibility.

12. RobotException

  • Description: Thrown by the UiPath Robot when an issue with the robot’s execution occurs.

  • Common when there are issues with robot connection or configuration.

  • Check robot settings or ensure proper connectivity.

13. OrchestratorHttpRequestException

  • Description: Occurs during failed communication between UiPath Robot and Orchestrator.

  • Common in scenarios like network failures or incorrect API configurations.

  • Ensure Orchestrator and robot are properly connected.

14. WorkflowNotFoundException

  • Description: Raised when a referenced workflow cannot be found.

  • Happens if the workflow was moved or deleted from its location.

  • Ensure workflows are correctly linked and not deleted.

15. DuplicateKeyException

  • Description: Triggered when trying to insert a duplicate key into a collection (e.g., Dictionary).

  • Typically occurs in data storage activities.

  • Use checks to ensure keys are unique before insertion.

16. ActivityTimeoutException

  • Description: Thrown when an activity’s execution exceeds the defined timeout.

  • Occurs in waiting or delay-based activities.

  • Adjust timeouts based on system performance or implement retries.

17. OperationCanceledException

  • Description: Raised when a task or operation is canceled before completion.

  • Occurs due to user or programmatic cancellation.

  • Handle by using cancellation tokens or appropriately stopping workflows.

18. ElementOperationException

  • Description: Raised when an operation (like clicking or typing) cannot be performed on a UI element.

  • Happens when an element is not available for interaction.

  • Ensure the element exists and is interactable before triggering actions.

19. DataReadException

  • Description: Occurs when there’s an issue reading data, such as from files or databases.

  • Seen in activities like "Read Range" or "Read CSV".

  • Verify file paths, formats, and access rights.

20. InvalidOperationException

  • Description: Thrown when an invalid operation is attempted on an object, such as calling a method in an incorrect state.

  • Can occur when data is in an unexpected state.

  • Ensure the correct operation sequence or data state before execution.

21. XPathException

  • Description: Raised when an XPath expression fails to locate an element.

  • Common in web scraping or automation tasks.

  • Validate XPath expressions or use more specific selectors.

22. AccessViolationException

  • Description: Triggered when the system attempts to access restricted memory.

  • Often occurs with system-level issues.

  • Requires debugging and checking for memory management issues.

23. ArgumentNullException

  • Description: Occurs when a method receives a null argument when one is not allowed.

  • Happens if methods expect a non-null argument but receive null.

  • Validate input arguments before calling methods.

24. OutOfMemoryException

  • Description: Raised when the system runs out of available memory during execution.

  • Occurs in memory-intensive operations, like processing large datasets.

  • Optimize memory usage or handle large data in chunks.

25. NotImplementedException

  • Description: Thrown when a method or functionality has not been implemented yet.

  • Typically used as a placeholder for future functionality.

  • Implement the required functionality or handle it with appropriate fallback.

26. InvalidOperationException

  • Description: Thrown when an operation is performed in an invalid context.

  • Can occur if operations are out of sequence or incompatible.

  • Ensure the correct context before performing operations.

27. ArgumentException

  • Description: Raised when a method receives an invalid argument.

  • Commonly seen with method calls that expect specific data types or ranges.

  • Validate input arguments to avoid invalid calls.

28. FileLoadException

  • Description: Occurs when a file cannot be loaded, typically due to corruption or an incompatible format.

  • Often seen when reading configuration files or assets.

  • Ensure correct file paths and formats.

29. TaskCanceledException

  • Description: Raised when an operation task is canceled either by the user or programmatically.

  • Seen in asynchronous tasks or long-running activities.

  • Handle by providing cancellation logic or allowing graceful shutdowns.

30. TargetInvocationException

  • Description: Thrown when an exception occurs during the invocation of a method using reflection.

  • Common in dynamic method calls or invocations.

  • Handle using appropriate exception handling or method validation.

Cheat sheet for remember:



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