how to make an event in Zoho calnder . when a deal is Won

i try this via

Actions by Zoho Flow when i get the error Zoho Calendar says "start pattern not matched."

how can i make an event in Zoho calender \ google calender
when deal is modifie to spcific stage - in the name of the deal
and when a the same deal is modifed to the next stage the event name will update to another name that i update