I have adapted Voxforge DE to my needs, adding missing words to the dictionnary, using a modified espeak2phones as the -original returned errors-, had to lowercase the umlaut letters. Now i return another error:
16:04:05.687 SEVERE lexTreeLinguist    Bad HMM Unit: ui
Feb 25, 2014 4:04:05 PM edu.cmu.sphinx.linguist.lextree.HMMTree addPronunciation
SEVERE: Missing HMM for unit r with lc=t rc=ui
16:04:05.696 SEVERE lexTreeLinguist    Bad HMM Unit: ui
Feb 25, 2014 4:04:05 PM edu.cmu.sphinx.linguist.lextree.HMMTree addPronunciation
SEVERE: Missing HMM for unit ui with lc=r rc=m
16:04:05.697 SEVERE lexTreeLinguist    Bad HMM Unit: ui
Feb 25, 2014 4:04:05 PM edu.cmu.sphinx.linguist.lextree.HMMTree addPronunciation
SEVERE: Missing HMM for unit m with lc=ui rc=t
16:04:05.703 SEVERE lexTreeLinguist    Bad HMM Unit: ui
Feb 25, 2014 4:04:05 PM edu.cmu.sphinx.linguist.lextree.HMMTree addPronunciation
SEVERE: Missing HMM for unit ui with lc=k rc=n
16:04:05.705 SEVERE lexTreeLinguist    Bad HMM Unit: ui
Feb 25, 2014 4:04:05 PM edu.cmu.sphinx.linguist.lextree.HMMTree addPronunciation
SEVERE: Missing HMM for unit n with lc=ui rc=t
16:04:05.712 SEVERE lexTreeLinguist    Bad HMM Unit: ui
Feb 25, 2014 4:04:05 PM edu.cmu.sphinx.linguist.lextree.HMMTree addPronunciation
SEVERE: Missing HMM for unit f with lc=ui rc=n
16:04:05.715 SEVERE lexTreeLinguist    Bad HMM Unit: ui
Feb 25, 2014 4:04:05 PM edu.cmu.sphinx.linguist.lextree.HMMTree addPronunciation
SEVERE: Missing HMM for unit ui with lc=k rc=r
16:04:05.715 SEVERE lexTreeLinguist    Bad HMM Unit: ui
Feb 25, 2014 4:04:05 PM edu.cmu.sphinx.linguist.lextree.HMMTree addPronunciation
SEVERE: Missing HMM for unit r with lc=ui rc=p
16:04:05.721 SEVERE lexTreeLinguist    Bad HMM Unit: e
Feb 25, 2014 4:04:05 PM edu.cmu.sphinx.linguist.lextree.HMMTree addPronunciation
SEVERE: Missing HMM for unit t with lc=ee: rc=e
16:04:05.721 SEVERE lexTreeLinguist    Bad HMM Unit: e
Feb 25, 2014 4:04:05 PM edu.cmu.sphinx.linguist.lextree.HMMTree addPronunciation
SEVERE: Missing HMM for unit e with lc=t rc=s
16:04:05.722 SEVERE lexTreeLinguist    Bad HMM Unit: e
Feb 25, 2014 4:04:05 PM edu.cmu.sphinx.linguist.lextree.HMMTree addPronunciation
SEVERE: Missing HMM for unit s with lc=e rc=t
16:04:05.767 SEVERE lexTreeLinguist    Bad HMM Unit: ui

>> Where does the error come from and how to fix this?
 I have attached the extended .dic attached with the .lm.DMP and the modified espeak file