This error means that your import configuration files are not correct. You need to explore your gateway/mappings directory in your client installation (most likely). You will see multiple xml files in this locations most likely that by default have the ALM_ prefix for all of the data objects. You will need to clean up these files and remove the ALM_ and potentially modify them to align to your data model configuration if it has changed from the template that was initially installed. As a best practice recommendation PTC recommends that you configure your imports on the server and remove the need to manage these in the client. Feel free to reach out to me and i can give you more details on how to accomplish that.