Created Unassigned: Unknown server tag 'ajaxToolkit:ToolkitScriptManager' error while Publishing WebForms in VS2013 [27740]

Hello,

While publishing the web forms application using VS2013 I am getting 2 errors repeated several times. These are:

1. /Site.Master(14,0):Error ASPPARSE: Unknown server tag 'webopt:bundlereference'.

2. /Site.Master(20,0): Error ASPPARSE: Unknown server tag 'ajaxToolkit:ToolkitScriptManager'.

I have tried the following:

1. Publish in Release version instead of debug

2. debug=false in web.config

3. web.config reference is already there -

```
<controls>
<add assembly="Microsoft.AspNet.Web.Optimization.WebForms" namespace="Microsoft.AspNet.Web.Optimization.WebForms" tagPrefix="webopt" />
<add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />
</controls>

```
Nothing seems to be working. __The solutions runs fine from within VS2013.__

Any help please!