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java.security.InvalidKeyException: Keystore operation failed	at android.security.KeyStore.getInvalidKeyException(KeyStore.java:692)	at android.security.KeyStore.getInvalidKeyException(KeyStore.java:712)	at android.security.keystore.KeyStoreCryptoOperationUtils.getInvalidKeyExceptionForInit(KeyStoreCryptoOperationUtils.java:54)	at android.security.keystore.AndroidKeyStoreSignatureSpiBase.ensureKeystoreOperationInitialized(AndroidKeyStoreSignatureSpiBase.java:219)	at android.security.keystore.AndroidKeyStoreSignatureSpiBase.engineInitSign(AndroidKeyStoreSignatureSpiBase.java:99)	at android.security.keystore.AndroidKeyStoreSignatureSpiBase.engineInitSign(AndroidKeyStoreSignatureSpiBase.java:77)	at java.security.Signature$SignatureImpl.engineInitSign(Signature.java:706)	at java.security.Signature.initSign(Signature.java:357)	at au.com.taylornetworks.tapid.keystoreContentSigner.getSignature(keystoreContentSigner.java:69)	at org.spongycastle.pkcs.PKCS10CertificationRequestBuilder.build(PKCS10CertificationRequestBuilder.java:149)	at au.com.taylornetworks.tapid.pkiManager.generateCSR(pkiManager.java:78)	at au.com.taylornetworks.tapid.MainActivity.createAndShowCSR(MainActivity.java:42)	at java.lang.reflect.Method.invoke(Native Method)	at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:270)	at android.view.View.performClick(View.java:5204)	at android.view.View$PerformClick.run(View.java:21153)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:148)	at android.app.ActivityThread.main(ActivityThread.java:5417)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)