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May 05, 2012 08:51 AM|LINK
There are three reasons can cause error 500.
1. In WebService add attribute [System.Web.Script.Services.ScriptService()] to class. 2. If you use another asp controls in the same aspx page add in 3. If yet you get error - try ValidateRequest="false" in the tag
Please check the following link about this error:
Please refer to this faq which tells you how to locate the cause. It's usually much easier to find it our in your practical environment.