I am trying to test the file RTX_EX1.C from the Keil samples directory for the RTX51 TINY, and for some reason I was not be able to compile/build. I am using UVISION2 V2.31 It keeps telling me the following message at the output windows: RAMSIZE (256) XDATA (0X000 - 0X03FF) ***FATAL ERROR L211: I/O ERROR ON OUTPUT FILE EXCEPTION 0029H: ACCESS TO FILE DENIED FILE: REAL_TIME Does anybody in this forum know what I did wrong here. Thanks in advance, JIMMY