EDIT: MEINE PROGUARD-VERSION IST 4.7

Heute habe ich versucht, einzuschließenjsoup (version 1.7.1) in meiner Android-Anwendung, aber es verursacht mir viele Probleme. Beim exportieren habe ich das unterschriebenapk mitproguard eingeschaltet Jedes Mal, wenn meine Anwendung auf erzwungene Probleme stieß, wurde sie deaktiviertproguard und exportiert dieapk und es lief perfekt. Bitte hilf mir. Wie kann ich den Fehler beheben? Der Stacktrace ist wie folgt:

java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:278)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:107
6)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:56
9)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.ExceptionInInitializerError
at org.jsoup.nodes.Document$OutputSettings.<init>(Unknown Source)
at org.jsoup.nodes.Document.<init>(Unknown Source)
at org.jsoup.parser.TreeBuilder.void initialiseParse(java.lang.String,java.lang.
String,org.jsoup.parser.ParseErrorList)(Unknown Source)
at org.jsoup.parser.TreeBuilder.org.jsoup.nodes.Document parse(java.lang.String,
java.lang.String,org.jsoup.parser.ParseErrorList)(Unknown Source)
                            boolean process(org.jsoup.parser.Token)
at org.jsoup.parser.HtmlTreeBuilder.org.jsoup.nodes.Document parse(java.lang.Str
ing,java.lang.String,org.jsoup.parser.ParseErrorList)(Unknown Source)
                                boolean process(org.jsoup.parser.Token)
                                boolean process(org.jsoup.parser.Token,org.j
soup.parser.HtmlTreeBuilderState)
                                void transition(org.jsoup.parser.HtmlTreeBui
lderState)
                                org.jsoup.parser.HtmlTreeBuilderState state(
)
                                void framesetOk(boolean)
                                void maybeSetBaseUri(org.jsoup.nodes.Element
)
                                org.jsoup.nodes.Element insert(org.jsoup.par
ser.Token$StartTag)
                                org.jsoup.nodes.Element insert(java.lang.Str
ing)
                                void insert(org.jsoup.parser.Token$Comment)
                                void insert(org.jsoup.parser.Token$Character
)
                                boolean isElementInQueue(org.jsoup.helper.De
scendableLinkedList,org.jsoup.nodes.Element)
                                void popStackToClose(java.lang.String[])
                                void insertOnStackAfter(org.jsoup.nodes.Elem
ent,org.jsoup.nodes.Element)
                                void replaceInQueue(java.util.LinkedList,org
.jsoup.nodes.Element,org.jsoup.nodes.Element)
                                boolean inSpecificScope(java.lang.String,jav
a.lang.String[],java.lang.String[])
                                boolean inSpecificScope(java.lang.String[],j
ava.lang.String[],java.lang.String[])
                                boolean inScope(java.lang.String,java.lang.S
tring[])
                                void insertInFosterParent(org.jsoup.nodes.No
de)
at org.jsoup.parser.Parser.org.jsoup.nodes.Document parse(java.lang.String,java.
lang.String)(Unknown Source)
at org.jsoup.Jsoup.org.jsoup.nodes.Document parse(java.lang.String)(Unknown Sour
ce)
at com.my.package.name.BalCheck.void doLogin(java.lang.String,java.lang
.String)(Unknown Source)
                                     void checkBal()
                                     void echo(java.lang.String)
at com.my.package.name.BalCheck.void doCheckBalance(java.lang.String,ja
va.lang.String)(Unknown Source)
at com.my.package.name.SmsPage$CheckUltooBalance.java.lang.Void doInBac
kground(java.lang.Void[])(Unknown Source)
                                                      void onPostExecute(jav
a.lang.Void)
at com.my.package.name.SmsPage$CheckUltooBalance.java.lang.Object doInB
ackground(java.lang.Object[])(Unknown Source)
at android.os.AsyncTask$2.call(AsyncTask.java:264)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
... 5 more
Caused by: java.lang.ExceptionInInitializerError
at org.jsoup.nodes.Entities$EscapeMode.<clinit>(Unknown Source)
... 18 more
Caused by: java.lang.NullPointerException
at java.util.Properties.load(Properties.java:246)
at org.jsoup.nodes.Entities.java.util.Map loadEntities(java.lang.String)(Unknown
 Source)
at org.jsoup.nodes.Entities.<clinit>(Unknown Source)
... 19 more