hi

i have nintex form license and installed on my server .but this error show in license page and in design page : 

"The server "srv-wfe1" is not currently licensed for the design or completion of Nintex Forms as a Web Front-End server. To licence this server as a Web Front-End please contact sales@nintex.com to add it to your Nintex Forms license."

but this is my license page : 

how can i install license on specially server as like "srv-wfe1" ?