Problems compiling Community Commons

Buildfile: C:\Mendix\FOM-main\deployment\build_core.xml

compile:
    [javac] Compiling 99 source files to C:\Mendix\FOM-main\deployment\run\bin
    [javac] C:\Mendix\FOM-main\javasource\communitycommons\Misc.java:664: error: unreported exception COSVisitorException; must be caught or declared to be thrown
    [javac] 		overlay.overlay(new HashMap<Integer, String>()).save(baos);
    [javac] 		                                                    ^
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] Note: C:\Mendix\FOM-main\javasource\com\mendix\core\Core.java uses unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 1 error

After moving an App to 6.10.3 and replacing older APPSTORE parts we run into this problem.

"Getting rid" of the ComComs "fixes" the errormessages......