Thanks for your help!
No error message when starting or using K-Meleon,and all the plugins that are missing work correctly.
I had renamed the NPSWF32.dll as npswf32.dll,but even though I keep it as NPSWF32.dll,the problem still occurs.
Finally,I keep some sentences of the plugins.properties in english,and the problem doesn't occur again,all the installed plugins could be shown now. :)
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