This error occurs because some of the needed client libraries for accessing HP ALM have not been downloaded onto the local machine.
The steps to resolve the issue are:
From the main HP ALM home page, click on the "HP ALM Add-Ins" link.
Then click on the "HP ALM Connectivity" download.
Download and install the HP ALM Connectivity plugin.
Now the Spira Importer will be able to connect.
If you still experience any issues, please contact Inflectra customer support.