You can get the error message if –

You are trying to activate a LoadComplete trial license on your computer while another trial license is already activated on this computer.

LoadComplete displays this message to inform you that the new trial license cannot be activated on this computer. You can activate a LoadComplete trial license only once on a computer. After the trial period expires, you cannot continue working with the product activated with the trial license key.

To use the product, you can either purchase the needed LoadComplete license and activate it, or activate a trial extension license key. For information on getting trial extensions, please contact the SmartBear Support Team.

To use the product, you can either purchase a commercial LoadComplete license and activate it, or you can upgrade the existing trial version to the commercial version during the trial period. To learn about upgrading from the trial version, see Upgrading LoadComplete Trial to LoadComplete Pro.
You are trying to activate the emergency license for the 25th time on this machine.

LoadComplete displays this message to inform you that the emergency license cannot be activated more than 24 times on the same machine. For more information on emergency licenses, see Emergency License Keys.

To resolve licensing problems, you can use the Licensing Troubleshooter on our web site:

The troubleshooter will also help you collect information and submit a request to the SmartBear Support Team.

Unable to Active the License on This Machine, Because Another Trial License for the Product Has Already Been Activated on It