How can i fix this issue on leave application

I have been trying to create a leave application and this error keeps on showing up everytime

Hi @Simon_Muturi1,

Please update the series number. so please go to the Document Naming Settings.

Then reload and check it.

Thank You!

I’m actually using V13 and i can’t see the document naming settings

Okay. I shared the version 15 image.

In Version 13, Please go to the Naming Series and set it according to the image that I provided. some functionality is different so check it accordingly.

Thank You!

It worked thanks @NCP