title: Unable to open a realm at path xxx
body: <p>I'm using the <code>Realm database</code> in our new project,however I got an <code>Exception</code> when open <code>Realm</code>,the full exception message is like this:</p>
  
  <blockquote>
    <p>io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.xxx/files/xxx.c8c50ce7d6dd4c85ace822d1d1d56dc0.realm': Not a Realm file. in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_SharedRealm.cpp line 92 Kind: ACCESS_ERROR.
        at io.realm.internal.SharedRealm.nativeGetSharedRealm(Native Method)
        at io.realm.internal.SharedRealm.getInstance(SourceFile:205)
        at io.realm.internal.SharedRealm.getInstance(SourceFile:182)
        at io.realm.RealmCache.createRealmOrGetFromCache(SourceFile:124)
        at io.realm.Realm.getInstance(SourceFile:227)</p>
  </blockquote>
  
  <p>This <code>exception</code> is hard to reproduce.
  What can be done to solve this problem ?</p>