The Issue Viewer allows you to examine graph issues, including errors and warnings, within Dynamo Player.
When a Dynamo Player graph runs with at least one issue, you’ll see an option to open Issue Viewer near the bottom of the application.

The Issue Viewer displays a list of all the errors or warnings affecting the graph in Dynamo. To learn more about each issue, click its title in the list, and more information about the issue will appear.
If the list of issues is long, and you are looking for a specific issue, you can easily find it by using the search feature. The search only covers issue titles, not the extended error or warning text.

To export issue data to CSV format, use the Export All option at the bottom of the Issue Viewer dialog. The data will include:
The exported issue data can help you or your BIM manager troubleshoot graph issues.