I want to calculate thermodynamic properties of a primitive cell of a crystal which contain a heavy metal ( actinide) with castep. but i get this error:

Please choose a norm-conserving, not ultrasoft, pseudopotential for the following elements:....

But in the electronic section/ more/potential/, norm-conserving pseudopotentioal (i.e. .recpot extension.) has not been observed for the element. how can i import norm-conserving psedopotentioal for the element ?

best regards