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copied!<p>I think the problem -- or at least part of it -- is that you're trying to call <code>this.getResources()</code> during your Activity's constructor, as shown by this line in the stack trace:</p> <pre><code>09-14 02:41:25.753: E/AndroidRuntime(23748): at com.idyseg.movilsecure.MSMasterControler.<init>(MSMasterControler.java:34) </code></pre> <p>As far as I know, the Resources are not available until the Activity's <code>onCreate</code> method has been called. Try moving the call to <code>createCertificateLogTxt</code> to your Activity's <code>onCreate</code> method.</p> <p>Also, if you defined the <code>KeyFileManager</code> class as an Activity just so that you could invoke <code>getResources</code> on it, then that's also part of the problem: If it's not being <em>used</em> as an Activity (that is, if it doesn't use the standard Activity lifecyle methods), then once again the Resources won't be available through this class. In this case, you want to modify <code>KeyFileManager.createCertificateLogTxt()</code> to pass the main Activity's Context as a parameter:</p> <pre><code>KeyFileManager.createCertificateLogTxt(Context context) { //.... Log.i(LOGFILE, "certificadoLog.txt Creado"+ context.getResources().getString(R.string.app_name)); } </code></pre> <p>And by the way: although it's not important, this line:</p> <pre><code> Log.e(LOGFILE, "No se puede crear certificadoLog.txt"+ R.string.LOGFILE, e); </code></pre> <p>looks suspicious to me; don't you want something like this?</p> <pre><code> Log.e(LOGFILE, "No se puede crear certificadoLog.txt " + getString(R.string.LOGFILE), e); </code></pre>

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