Could not sign data

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at org.xdi.oxauth.model.crypto.OxAuthCryptoProvider.sign(
at org.xdi.oxauth.client.TokenRequest.getClientAssertion(
at org.xdi.oxauth.client.TokenClient.exec(
at org.xdi.oxauth.client.uma.wrapper.UmaClient.request(
at org.gluu.oxtrust.service.UmaProtectionService.retrievePatToken(
at org.gluu.oxtrust.service.UmaProtectionService.getPatToken(
at org.gluu.oxtrust.service.UmaProtectionService.isExistPatToken(
at org.gluu.oxtrust.service.UmaProtectionService.isEnabledUmaAuthentication(

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