Hi there!
Sorry for the inconvenience!
You can try the following:
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Please take a full site backup first in order to prevent any data loss.
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Please uninstall your SP Simple Portfolio component by 1st unpublishing your module/extension (from the Extensions\Modules tab) and trashing it.
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Then go to Extensions tab again and navigate to "Manage" and find your SP Simple Portfolio extension, then unpublish it and then 'Uninstall' from menu option.
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Download a fresh copy / package of the SP Simple Portfolio Extension from JoomShaper's Extensions Download page and reinstall, then recreate a module, and its content.
PS: you are basically then disassociating the original database associated with the template and allowing the Extension upon new installation to recreate a new / blank database that will work with current version of template
If the error persists, please go to this location: templates\Your_Template\html and rename mod_spsimpleportfolio folder if there any. Then check your issue.
Hope this helps!
Note: Please take a full site backup before trying anything!
Best Regards