No object file generated after compilation in uvision 1.13

I am using uvision 1.13 to build project based on old project file.
issue is:
1. after change of source code, the old object file are not updated, but list file (.lst) updated.
2. If moving .obj file to somewhere else and building, error message "missing object file".
3. C51 can detect syntax error in c souce code.

Highly appreciation for advice.

Regards

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