AT89C51 problem with RTXtiny

I have one program with RTXtiny on AT89C51. I compiled it successfully. Message was: Program Size: data=94.3 xdata=0 code=3903 creating hex file from "ds1302"... "ds1302" - 0 Error(s), 0 Warning...
AT89C51 problem with RTXtiny

I have one program with RTXtiny on AT89C51. I compiled it successfully. Message was: Program Size: data=94.3 xdata=0 code=3903 creating hex file from "ds1302"... "ds1302" - 0 Error(s), 0 Warning...
about rtxtiny

*** FATAL ERROR L257: RTX51-TINY REQUIRES UPGRADE TO PK51 ----How can i solve this problem? thank you!
about rtxtiny

*** FATAL ERROR L257: RTX51-TINY REQUIRES UPGRADE TO PK51 ----How can i solve this problem? thank you!
Firmware (using RTXTiny) 80C552 -> Dallas DS87C550

Hi there, is anybody experienced in migrating existing software to the DS87C550? I have an existing software, that I didn't write, that was running on the 30MHz Version of the 80c552. This processor...