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This exception has no message.
java.lang.NullPointerException: 	at com.ibm.commerce.price.commands.PriceRuleGetContractUnitPriceCmdImpl.getRuleExecutionCommand(PriceRuleGetContractUnitPriceCmdImpl.java:512)	at com.ibm.commerce.price.commands.PriceRuleGetContractUnitPriceCmdImpl.executeRule(PriceRuleGetContractUnitPriceCmdImpl.java:419)	at com.ibm.commerce.price.commands.PriceRuleGetContractUnitPriceCmdImpl.calculatePrices(PriceRuleGetContractUnitPriceCmdImpl.java:198)	at com.ibm.commerce.price.commands.PriceRuleGetContractUnitPriceCmdImpl.performExecute(PriceRuleGetContractUnitPriceCmdImpl.java:123)