Alright, let's get started by setting up a new screen in Adalo for handling errors. This screen will show custom error messages when things go awry.

• Head over to the Screens section in Adalo.
• Hit the "+" button to add a new screen.
• Pick a blank template or an error screen template, and name it “Error Screen”.

Next, let's add some components to this screen to display error messages and other relevant info.

• Drag and drop a Text component onto the screen.
• Customize this text component to say something like “An error occurred” by default.
• Add another Text component or a Label to dynamically show specific error messages.
• Maybe throw in an Icon, button, or image that indicates an error state.

Now, let's create a data collection to store different types of error messages that can be displayed dynamically.

• Navigate to the Database section in Adalo.
• Add a new collection and call it “Error Messages”.
• Create fields in this collection like ID, Error Code, and Error Message.

Time to update the components so the displayed error message reflects the specific issue.

• Set the text of one of the Text components to a Magic Text linked to the Error Message field from the Error Messages collection.
• Use conditional actions or visibility rules to show relevant error messages based on specific criteria or error codes.

Now, let's update workflows to redirect to the Error Screen when an error is detected.

• Open any workflow where error handling is needed.
• Add conditional actions within the workflow to check if the operation has failed.
• Use a custom action or set a variable that triggers the error.
• Set the action "Link to Error Screen" upon failure. Pass necessary error details as parameters to the error screen if needed.

In the Error Screen, configure it to retrieve and display error messages passed from the previous screen.

• Go to the Error Screen.
• Set up Magic Text or variables to grab error parameters from the previous screen or actions.
• Bind these parameters to the error text components, ensuring the relevant error message gets displayed.

Finally, let's thoroughly test the custom error handling to make sure it works as expected.

• Trigger scenarios in your app that would cause an error.
• Check if the user is correctly redirected to the Error Screen.
• Verify that the correct error messages are displayed based on the error conditions.
• Make adjustments as necessary to handle all potential error scenarios gracefully.