>>I have developed an build tool the uses a script language to build several projects and generate a installation package. The problem is that some of the project are failing to build do to a "File cannot be closed because outstanding references exist." I know it is referring to a open object, but I checked and there are no objects. I assume when the project is open and built that the class libraries are been cache somehow. If this correct, how do clear the cache?
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>>If anyone have any other suggestion, please reply.
>
>Did you try clear all, clear resources before attempting to build ?

Been there, tried that, and more. The CLEAR ALL statement would wipe out all by control variable that drive how the build is performed. Before performing the build I am issuing a

CLOSE ALL
CLEAR PROGRAM
CLEAR PROGRAM    && sometimes first does not get them all.
CLEAR RESOURCE
SYS(1104)        && clear the cache