After doing some searching we resolved it. You can resolve this error by modifying the web.config file, and add / modify the Configuring JSON Serialization.
<configuration> <system.web.extensions> <scripting> <webServices> <jsonSerialization maxJsonLength="5000"/> </webServices> </scripting> </system.web.extensions> </configuration>
The default length is 102400.
You can get more information about this from MSDN : http://msdn.microsoft.com/en-us/library/bb763183.aspx