Since Infiniti v8.6.4, the validation error in subject has been made more detailed (errors were not sufficiently detailed in prior versions).
In Design, it is always good practice to validate a project (check for errors) before saving and publishing a project in Produce. This reduces the risk of design errors that could compromise the behavior of the project in Produce.
In Design, an open project can be checked for design errors by clicking the "validate" button as shown below:
If errors exist in the project, a screen similar to the one below will be displayed. Design errors will be shown in a validation message box as indicated:
Double clicking any error message will highlight the area in the project where this error exists:
Once the error has been rectified, a second validation exercise will update this list. Once all errors are remedied, the following message will displayed - the project is now ready to be saved and published in Produce.