[Wien] [SPAM?] Covergence Problems of Slab Calculation

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Dear wien-users,
        When I used my Fe adsorption model on Zn4O4 with 40Bohr Vacumm between Slab Layers, executed the program "run_lapw -p -i 80 -cc 0.0001  >out&", and the covergence results What i get  from the case are like the things show @last.
        For the Fe reasons I choose -7.0Ry to seperate the core & Valence.RKmax 7.0 .
        The question that puzzled me should be "IS there any problems with my structure,especially the Fe-O bond-length?and the bond-length of the Fe-O I chose is 2.13870 angstrom, and What should I do to change the length, Increase or decrease?or maybe not the bond-legnth reason? 

         And What Should I do to check the reason?How?
         Thanks a lot! 

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