When opening up a workflow related SmartForm, an error will be shown which will prevent you from working on the Form.


The following error is shown:


Error message:


Type: System.ArgumentException

Source: SourceCode.Forms

Method Base ◦Member Type: Method ◦Name: FromXml ◦Module

Scope Name: SourceCode.Forms.dll ◦Declaring Type

Full Name: SourceCode.Forms.Runtime.Execution.BrokerPackageCollection

Stack Trace: at SourceCode.Forms.Runtime.Execution.BrokerPackageCollection.FromXml(String definition) at SourceCode.Forms.Runtime.Execution.BrokerPackageCollection.Get(String xml, Boolean& wasCached) at SourceCode.Forms.AppFramework.FormRuntime.WorkXmlToApi(Stream input, Stream output) at SourceCode.Forms.Runtime.AJAXCall.ProcessRequestInternal(HttpContext context)"

The issue occurs because of a setting in the Web.config file located on your K2 Environment under the following path: [Drive]:\[Program Files]\K2 blackpearl\K2 smartforms Runtime

If you have this setting enabled:

  • <add key="TraceFilter" value="FormRuntime"/>

And you have this set to true:

  • <add name="EnableTracing" value="false" />

You will experience the error mentioned above.

For more information on this config file, please have a look at this link:


This has been identified as bug in the product. To fix the issue, please change this setting to false:

<add name="EnableTracing" value="false" />

[Drive]:\[Program Files]\K2 blackpearl\K2 smartforms Runtime\Web.config

Once you have made this change you will need to restart IIS and the K2 Service