The TaroWorks app communicates with Salesforce via the TaroWorks Site, that Site is missing the needed permission(s) to perform the required action.
This is due to a misconfiguration within salesforce. The System Administrator should do the the following:
- Check PART D: Enable Apex Class Access in Public Access Settings in Configuring TaroWorks in Salesforce.com and make sure all required classes are added.
- Always check the upgrade instructions in the release notes after installing a new TaroWorks package.
- Take care when changing existing settings.