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Have you copied the .dll and .pdb library files to the correct ProgramData subfolder?
Please refer to the Automating the deployment process section of this blog post.
The PI System Explorer will copy automatically .dll library to the ProgramData (so you don't need to guess which folder it should be copied to), but you need to copy the .pdb file manually or using Visual Studio to this same folder as suggested on the blog post.
Please let me know if this helps you!
Excellent! thanks very much.