SSIS之The variable might not exist错误解决

近日学习SSIS，在学习联机丛书的教程3时遇到如下错误，于是返回去看了下教程二，原来使用枚举器要经过一个包变量，类似程序设计语言中的临时循环变量，而拷贝教程二中的示例之后，不知道为什么这个varFileName包变量怎么不见了，重新创建该变量之后问题解决。

标题: Microsoft Visual Studio
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保存包时出现一般错误:
Lesson 1 出错: The variable "用户::varFileName" was not found in the Variables collection. The variable might not exist in the correct scope.

Lesson 1 出错: Attempt to parse the expression "@[用户::varFileName]" failed and returned error code 0xC00470A6. The expression cannot be parsed. It might contain invalid elements or it might not be well-formed. There may also be an out-of-memory error.

Lesson 1 出错: The expression "@[用户::varFileName]" on property "ConnectionString" cannot be evaluated. Modify the expression to be valid.

 

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