[spring-boot] Error resolving template "index", template might not exist or might not be accessible by any of the configured Template Resolvers

For me the issue was because of Case sensitivity. I was using ~{fragments/Base} instead of ~{fragments/base} (The name of the file was base.html)

My development environment was windows but the server hosting the application was Linux so I was not seeing this issue during development since windows' paths are not case sensitive.

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