Looking at the log tell us the origin of problem:
Quote:
at com.amazon.kindle.kindlet.internal.security.G.getC hars(vrc:1333)
at vn.vhn.amazon.kindle.chinesechess.posCollection.lo calIsSolved(Unknown Source)
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It seems that the application cannot read from its local preferences storage due to some security error. I think that the local storage is encrypted by the sign or anything relating to the application.
You may resolve that error by a try catch in that function
Code:
try{
//reading from pref
}catch(Exception ex){
//reading error, clear all the pref, and then try reading again
}