A problem with runing the alt_dspbuilder_createComponentLibrary

>> alt_dspbuilder_createComponentLibrary
Error in block : Arria_II_GX_EP2AGX125_alteradspbuilder2/4-Bit DIP Switch
Java exception occurred:
com.altera.dspbuilder.simulation.MaskInitialisatio nException: Exception in block 'Arria_II_GX_EP2AGX125_alteradspbuilder2/4-Bit DIP Switch'


at com.altera.dspbuilder.simulation.Mask.init(Unknown Source)


Caused by: java.lang.NullPointerException


at com.altera.dspbuilder.simulation.Model.getAbsolute TestbenchPath(Unknown Source)


at com.altera.dspbuilder.simulation.Model.getValidIOF ile(Unknown Source)


at com.altera.dspbuilder.simulation.Model.getSaltFile ForBlock(Unknown Source)


at com.altera.dspbuilder.simulation.blocks.IOBlock.ge tIOFile(Unknown Source)


at com.altera.dspbuilder.simulation.blocks.IOBlock.ge tIOFileNames(Unknown Source)


at com.altera.dspbuilder.simulation.blocks.IOBlock.ac cess$000(Unknown Source)


at com.altera.dspbuilder.simulation.blocks.IOBlock$IO BlockLibrary$1.eval(Unknown Source)


at com.altera.etc.minieval.MiniEvalImpl.call(Unknown Source)


at com.altera.etc.minieval.MiniEvalImpl._factor(Unkno wn Source)


at com.altera.etc.minieval.MiniEvalImpl._term(Unknown Source)


at com.altera.etc.minieval.MiniEvalImpl._expr3(Unknow n Source)


at com.altera.etc.minieval.MiniEvalImpl._expr2(Unknow n Source)


at com.altera.etc.minieval.MiniEvalImpl._expr(Unknown Source)


at com.altera.etc.minieval.MiniEvalImpl._cond(Unknown Source)


at com.altera.etc.minieval.MiniEvalImpl._root(Unknown Source)


at com.altera.etc.minieval.MiniEvalImpl._top(Unknown Source)


at com.altera.etc.minieval.MiniEvalImpl.evaluate(Unkn own Source)


at com.altera.dspbuilder.simulation.Block.calculateEx pressionParameters(Unknown Source)


... 1 more



Error executing : save_system('Arria_II_GX_EP2AGX125_alteradspbuilde r2', 'Arria_II_GX_EP2AGX125_alteradspbuilder2');
Previous command was : set_param('Arria_II_GX_EP2AGX125_alteradspbuilder2/PB1', 'Position', [160 312 200 358]);
Error using save_system (line 38)
An error occurred during a callback while saving
'C:\altera\12.1sp1\quartus\dsp_builder\bin\mdllibr ary\Arria_II_GX_EP2AGX125_alteradspbuilder2.slx'.
The previously saved version of this file (if any) has not been changed.


Error in save_system (line 38)
throw(e);


Error in
C:\altera\12.1sp1\quartus\dsp_builder\bin\matlab\a lt_dspbuilder_createComponentLibrary.p>alt_dspbuil der_createComponentLibrary
(line 28)


thanks very much ,it may be the problem when save as the .slx file.