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Error occurred while loading data. Check the log files for details – Custom Specification error

We experienced this issue with the template deployment with the custom specification wizard. The important thing here is we experienced this issue soon after the vSphere 6.5 upgrade. Our Virtual Machine deployment team reached us to find a solution after the upgrade.

Previously, they were using the old C# client to deploy the Virtual Machines and with the change of the vCenter this issue came in to the action. I thought to write this post to share and explain the findings and the steps to resolve the issue.

Error occurred while loading data. Check the log files for details

First thing first what are the permission levels required?

Below permission levels should be fulfilled to use the custom specifications for a Role.

Virtual Machine -> Provisioning -> Read Customization Specifications

Virtual Machine -> Provisioning -> Modify Customization Specifications

Also, the created or role that these provisioning users are sitting at should be applied to the vCenter level, it was added to the Datacenter level and I had to change it to the vCenter level as shown in the below screen capture

After that our provisioning engineers were able to see the custom spec scripts

Still not finished…..

“The public key in the specification does not match the vCenter public key. You have to reenter the password in order to proceed”

This error appeared after fixing the above issue

So we had to update the passwords of the templates, follow below steps to update the template passwords

Click on the “Home” icon and select the “Policies and Profiles

Select the “Customization Specification Manager” and select the template and click on “Edit” icon

Select the “Administrator Password” and update it in the wizard

Click “OK” to complete the change

After that we were able to use the Customization Specification scripts without any issues

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Error occurred while loading data. Check the log files for details – Custom Specification error
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Aruna Lakmal

Associate Technical Lead at Pearson, Sri Lanka. Technology junky, enthusiast, a VMware vExpert and a blogger with more than 6 years of Experience in Information Technology more focusing on VMware Virtualization, Microsoft and Datacenter Technologies.

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