java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at org.json.JSONArray.writeTo(JSONArray.java:612)
at org.json.JSONStringer.value(JSONStringer.java:233)
at org.json.JSONObject.writeTo(JSONObject.java:720)
at org.json.JSONObject.toString(JSONObject.java:689)
at superapp.networkapp.LogTool.saveLog(LogTool.java:73)
at superapp.networkapp.LogTool.updateLog(LogTool.java:91)

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