This article was created in response to a support issue logged with K2. The content may include typographical errors and may be revised at any time without notice. This article is not considered official documentation for K2 software and is provided "as is" with no warranties.


After upgrading to K2 5.2, an error occurs when you execute a WCF Endpoint SmartObject method. This occurs after a K2 service restart or a system reboot.


The following error is displayed:  "Value cannot be null. Parameter name: s"



To resolve this, please download and install K2 Five (5.2) FixPack 5.