I have installed the WSS v3 and MOSS 2007 SP1 on my demo machine. After that all my sites including Central Admin gives the following Parser error:
“ResX input is not valid. Cannot find valid "resheader" tags for the ResX reader and writer type names”
After some investigations I realize that the new SharePoint Service Pack 1 add some XML tags to the header information of the resources files except to the custom resources files. To avoid this problem simply add the following tags to the header information of the custom resources file located in the folder App_GlobalResources of your web application home directory:
<resheader name="resmimetype">
<value>text/microsoft-resx</value>
</resheader>
<resheader name="version">
<value>2.0</value>
</resheader>
<resheader name="reader">
<value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
</resheader>
<resheader name="writer">
<value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
</resheader>
Do not forget to do an IISRESET.
After that I get the following Exception error message (Event ID 1310): “Could not load file or assembly 'Microsoft.SharePoint.ApplicationPages, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' or one of its dependencies. The system cannot find the file specified”.
To solve this problem (Thanks to Adnan Al-Ghourabi) you have to make the change through IIS, make sure to go to the Web.config file and replace : <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> with <configuration>.
