why SSIS cant recognize dynamically variable set in XML config file for connection of child package?



I have a SSIS package. I use SSIS 2008 r2.It has parent package start package and it call 3 child package . i want to dynamically set connection property of these child packages and my connection strings then i use XML configuration file and add 3 variable to start package and set this variable in expression of packages but when i run this package as file system in SQL server it show me this error .any tips or trick would be welcome .thanks in advance.enter image description here


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