# Configuration Error

**URL:** <https://forum.litium.com/t/configuration-error/646>\
**Category:** Questions\
**Created:** [March 4, 2019, 11:13am UTC](https://forum.litium.com/t/configuration-error/646 "2019-03-04T11:13:03Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![natnael.lijato](https://avatars.discourse-cdn.com/v4/letter/n/8491ac/32.png) [@natnael.lijato](https://forum.litium.com/u/natnael.lijato)\
**Post date:** [March 4, 2019, 11:13am UTC](https://forum.litium.com/t/configuration-error/646/1 "2019-03-04T11:13:03Z")

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I upgrade successfully from Litium 6 to Litium 7, and i get this error when i star litium site  
Could not load file or assembly ‘System.Runtime, Version=4.1.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’ or one of its dependencies. The system cannot find the file specified.

How can i fix it?

Litium version: _[upgrading from 6 to 7]_

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**Author:** ![steve.redstorm](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/steve.redstorm/32/14_2.png) [@steve.redstorm](https://forum.litium.com/u/steve.redstorm)\
**Post date:** [March 4, 2019, 12:29pm UTC](https://forum.litium.com/t/configuration-error/646/2 "2019-03-04T12:29:48Z")

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Try to remove the bindinRedirect in web.config and test.  
Also check the version of the System.Runtime on the reference/properties to check if you got the right verion.

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**Author:** ![natnael.lijato](https://avatars.discourse-cdn.com/v4/letter/n/8491ac/32.png) [@natnael.lijato](https://forum.litium.com/u/natnael.lijato)\
**Post date:** [March 4, 2019, 1:56pm UTC](https://forum.litium.com/t/configuration-error/646/3 "2019-03-04T13:56:46Z")

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I did but dose not work. Here is log msg:  
LOG: This bind starts in default load context.  
LOG: Redirect found in application configuration file: 4.0.10.0 redirected to 4.1.2.0.

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**Author:** ![steve.redstorm](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/steve.redstorm/32/14_2.png) [@steve.redstorm](https://forum.litium.com/u/steve.redstorm)\
**Post date:** [March 4, 2019, 2:01pm UTC](https://forum.litium.com/t/configuration-error/646/4 "2019-03-04T14:01:11Z")

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Make sure you got same assembly version number for System.Runtime on all projects in your solution and check the version number in the csproj file also.

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**Author:** ![patric.forsgard](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/patric.forsgard/32/10_2.png) [@patric.forsgard](https://forum.litium.com/u/patric.forsgard)\
**Post date:** [March 4, 2019, 2:02pm UTC](https://forum.litium.com/t/configuration-error/646/5 "2019-03-04T14:02:57Z")

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Try to clean out all binding redirects, build the solution and correct the binding redirects with the message in error pane. See binding redirects on [https://docs.litium.com/documentation/upgrading-to-litium-7](https://docs.litium.com/documentation/upgrading-to-litium-7)