May be you can fix your problem after that please look againt your jar size its different before you to do obfuscated package after that change your jad properties with new jar from obfuscated package, and afther that try obfuscated package again.
At jad that have some optional that name is MIDlet-Jar-Size is change with new jar (best before please try to obfuscated package -> at here it would be error but it has been created jar but it size its different before your jar not at obfuscated package)
If that after you change that size jar at that optional still error you must download that application because that jar application for to obfuscated package
However, I don't know the cause of that problem. It seems that some program style would 'confuse' the obfuscator in some way. Moreover, I found that the resulting jar come out from this solution may not be functional in Motorola's mobile phone...