This question has been asked once in this forum, some 250 posts ago
, in the good old times when the author still answered questions, but never answered (there were two questions and only the last one has been treated). Actually it has been asked a second time, but being related to "pirated material" it wasn't answered.
Finding that error line in the log of multiAVCHD I thought that BDSubToSup has problems with java. Found that tool in its directory and double-clicked onto it - it started and worked with no problems. Not even the addition of the java and java/bin directories in the PATH variable changed something.
I am not really 100% sure but it worked once, however I do not remember if I carried out any modifications to the system apart from installing new software.
So, has anyone any idea what exactly this error message means and/or how to prevent its occurrence?