Pascal - Error 70:Unit version mismatch (<file>)...

unit version mismatch

Hi everybody. I'm working on a project software written in Pascal. In fact i don't know pascal very well, but before me, this program has written in pascal long times ago. And we found a bug in software. So i have to correct this bug. I put all related ".tpu" files in working directory and tried to compile before searching the source of bug. Because after correcting the bug i must recompile the project. If compilation doesn't work my work becomes useless.
So, during compiling this error occurs : "Error 70:Unit version mismatch (<file>)...". i found <file>'s source(".pas") and tried to recompile it. Bu it gives the same error with other file. This errors goes 4-5 files with same errors. When During compiling the last file i tried, same error occured with previous file. I mean "X" file gives this error with "Y" file. And "Y" file gives same error with "X" file. The project has written in Pascal 7.0 so i'm using it too. How can escape from this paradox. If i did't write clearly please ask me. :roll: :?

Thanks for your interests...

error 70 pascal

Hi,
if you have all the sources for the units in the uses phrase(s) (except the standard units crt, dos...) a >compile>build should do the job. The switch under compile: Destination Disk