Unable to instantiate Action, spendingContractAction, defined for 'spendingContractAction!to_addKno

Unable to instantiate Action, spendingContractAction, defined for ‘spendingContractAction!to_addKnot’ in namespace '/business’Method [to_getComFeeInfoJson] was discovered in the .class file but cannot be resolved in the class object - action - file:/E:/eclipseWorkSpace2/.metadata/.plugins/org.eclipse.wst.server.core
今天写代码时候，程序出现了这个bug，经过检查发现是因为import的包不正确造成的。