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java.security.SignatureException: Could not sign data	at sun.security.ec.ECDSASignature.engineSign(ECDSASignature.java:297)	at java.security.Signature$Delegate.engineSign(Signature.java:1205)	at java.security.Signature.sign(Signature.java:578)	at org.xdi.oxauth.model.crypto.OxAuthCryptoProvider.sign(OxAuthCryptoProvider.java:212)	at org.xdi.oxauth.client.TokenRequest.getClientAssertion(TokenRequest.java:357)	at org.xdi.oxauth.client.TokenClient.exec(TokenClient.java:295)	at org.xdi.oxauth.client.uma.wrapper.UmaClient.request(UmaClient.java:173)	at org.gluu.oxtrust.service.UmaProtectionService.retrievePatToken(UmaProtectionService.java:290)	at org.gluu.oxtrust.service.UmaProtectionService.getPatToken(UmaProtectionService.java:116)	at org.gluu.oxtrust.service.UmaProtectionService.isExistPatToken(UmaProtectionService.java:131)	at org.gluu.oxtrust.service.UmaProtectionService.isEnabledUmaAuthentication(UmaProtectionService.java:126)