Thank you for writing to us.
We have managed to reproduce the reported behavior on our side – our team is going to investigate this further and return to you with a fix ETA Aug 10th.
Please let us know if this works for you.
We are pleased to inform you that the issue with empty “dateInvalidCaption” was fixed.
This is available in the 2.8.13 version of Flexmonster: https://www.flexmonster.com/release-notes/.
You are welcome to update the component.
Here is our updating to the latest version guide for assistance: https://www.flexmonster.com/doc/updating-to-the-latest-version/.
Please contact us in case any questions arise.