Parser Error Message: Section or group name 'system.web.extensions' is already defined.

facing below error in my development machine when i try to access to one of my application that running in ASP.NET framework 2.0

Configuration Error

Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: Section or group name 'system.web.extensions' is already defined. Updates to this may only occur at the configuration level where it is defined.

Source Error:

Line 2: Line 3: Line 4: Line 5: Line 6:

Source File: C:\Inetpub\wwwroot\xxxxx\web.config Line: 4

Show Additional Configuration Errors:

Section or group name 'scripting' is already defined. Updates to this may only occur at the configuration level where it is defined. (C:\Inetpub\wwwroot\formlookup_ajax2\web.config line 5) Section or group name 'scriptResourceHandler' is already defined. Updates to this may only occur at the configuration level where it is defined. (C:\Inetpub\wwwroot\formlookup_ajax2\web.config line 6) Section or group name 'webServices' is already defined. Updates to this may only occur at the configuration level where it is defined. (C:\Inetpub\wwwroot\formlookup_ajax2\web.config line 7) Section or group name 'jsonSerialization' is already defined. Updates to this may only occur at the configuration level where it is defined. (C:\Inetpub\wwwroot\formlookup_ajax2\web.config line 8) Section or group name 'profileService' is already defined. Updates to this may only occur at the configuration level where it is defined. (C:\Inetpub\wwwroot\formlookup_ajax2\web.config line 9) Section or group name 'authenticationService' is already defined. Updates to this may only occur at the configuration level where it is defined. (C:\Inetpub\wwwroot\formlookup_ajax2\web.config line 10)

Situation:

In My IIS setting

My Default Web Site Location path point to an application that running asp.net framework 3.5

When i access to one of my application that park under Default Web Site that running in asp.net framework 2.0, it hits error above.

Solution:

Remove the Default Web Site Location path solve my problem.