*** FATAL ERROR L257: RTX51-TINY REQUIRES UPGRADE TO PK51
----How can i solve this problem?
thank you!
It tells you clearly & explicitly what you need to do: UPGRADE TO PK51
What more is there to say?!
Contact details for Keil & their distributors are available via the appropriately-named 'Contact' link at the foot of the page:
http://www.keil.com/company/contact.asp