Why is a compilation error displaying with the warning "Empty switch block"? (Power Surveys)

When survey validation fails and displays a Compilation Error similar to:

Response_xxxx_Test.cs(xxxxx, x): warning: Empty switch block
Response_xxxx_Test.cs(xxxxx, x): error: The name <QuestionName> does not exist in the current context.

The Compilation Error may be referring to an invalid pipe or an incorrect question reference in a script. If the error is pointing to a pipe or script, you can follow the steps below to find the item causing the issue.

Detailed Steps

Find the pipe causing the compilation error

1. Navigate to the Preview tab.
2. Press CTRL+F on your keyboard to open the Find feature.
3. Search for [% to find the beginning of a pipe.
4. Use the Next button to navigate through the study preview to find pipes.
5. Make required changes to the relevant pipe under the Questionnaire tab and attempt to Validate the study.

Find the script causing the compilation error

1. Click the Validate button to retrieve the Compilation Error.
2. View the summary.
   • Find the reference to the question containing the script.

• The line after the warning: Empty switch block will contain the question name.
  For Example: Compilation error(s) occurred in the OnLoad method of the "Test2" ChoiceQuestion:
  In the above example, Test2 is the name of the question with the erroneous script. 

1. Navigate to the question name mentioned in the Compilation Error.
2. Edit or remove the script.
   • Edit the script will require updating the question name in the script to reflect the new question name from the study.

• Remove the script entirely to successfully validate. Re-author the script if required.

More Information

Read this article to learn more about Piping.