java.security.SignatureException: Could not sign data

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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)

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