Unable to require tag on server side in Riot JS

When I declare: require('./public_html/Tags/blog_post_details.tag'), I get the following error:

E:\WORKSPACE\NETBEANS_WORKSPACE\MyProject\public_html\Tags\blog_post_details.tag:1
(function (exports, require, module, __filename, __dirname) { <blog_post_details >
                                                              ^

SyntaxError: Unexpected token <
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:387:25)
    at Object.Module._extensions..js (module.js:422:10)
    at Module.load (module.js:357:32)
    at Function.Module._load (module.js:314:12)
    at Module.require (module.js:367:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (E:\WORKSPACE\NETBEANS_WORKSPACE\MyProject\server.js:7:1)
    at Module._compile (module.js:413:34)
    at Object.Module._extensions..js (module.js:422:10)

The path is correct because this line works var commonsFile = require('./public_html/Tags/commons.json');

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