It is a tricky issue for us. We would like to get the data into the application, but a lot of LogViewPlus features are built with the assumption that a timestamp will be available. For example, merge files use the timestamp to sort the log entries.
Dropping the requirement would likely make some parts of the application more confusing. Also, it is not clear how common this problem is, but I believe that most log files do provide a timestamp.
We could just auto-generate a "hidden" timestamp and not show the column. This would work and it is maybe something that we need to investigate. This requirement dates back to some early versions of the application and it may be time for a re-think.
For now, we can definitely improve the error reporting.
Thanks for bringing this issue to our attention,