I am getting following errors while exporting a Community Template from Sandbox

Error 1:TileMenu : We can’t validate the page you’re exporting. In field: Network - no CommunityTemplateDefinition named PortalF52 found
Error 2:Default Navigation : We can’t validate the page you’re exporting. In field: Network - no CommunityTemplateDefinition named PortalF52 found
Error 3:TileMenu : We can’t validate the page you’re exporting. In field: Network - no CommunityTemplateDefinition named PortalF52 found
Error 4:PortalF52 : We can’t validate the page you’re exporting. In field: defaultThemeDefinition - no CommunityThemeDefinition named PortalF52 found

Is there is pre-requisites I need to do before exporting a template? 

any help is appreciated. 

Thanks