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Server Error: "Could not load file or assembly 'K2Field.K2Forms.Controls.Charting'or one of its dependencies. The system cannot find the file specified"

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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.
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This article has been archived, and/or refers to legacy products, components or features. The content in this article is offered "as is" and will no longer be updated. Archived content is provided for reference purposes only. This content does not infer that the product, component or feature is supported, or that the product, component or feature will continue to function as described herein.

Issue

The following error appears when trying to register a site against a SharePoint environment, or when accessing Designer:
"Could not load file or assembly 'K2Field.K2Forms.Controls.Charting' or one of its dependencies. The system cannot find the file specified."

Symptoms

The issue was caused by a missing custom control DLL in C:\Program Files (x86)\K2 blackpearl\K2 SmartForms Designer\bin\ folder. 

You can read more it in this reference.

Troubleshooting Steps

To resolve the issue, copy the required DLLs into the folder