ANT Error Message - java.lang.RuntimeException: data starting at XXX is in unknown format

I just wasted entire day on stupid error from ANT:

Build file:
C:\XXXXXX\build.xml
init:
starteam:

rubicon:
lib_selection:
build_td_manifest:
compile:
dist_no_test:

BUILD FAILED
C:\z\qc-project\qcdev\Server\TdCore\build.xml:139:
java.lang.RuntimeException: data starting at 14600 is in unknown format

Finally I found the simple solution - just run 'clean' target from the ANT file and run the main target again. So simple, so frustrating.