What does the order rejection error " RMS: NO Last Trade Price" mean?

RMS: NO Last Trade Price

This error occurs if the stock for which the order has been placed isn’t traded on the exchange anymore.Hence the order was rejected & the above error was displayed.

Also if a stock has been moved to a different series/group [ex- from BE to EQ in NSE], and an order is placed in the older series, it gets rejected & the above error gets displayed.