Deno Module Still Buggy

[mimed100]

error: Uncaught (in promise) NotFound: Das System kann die angegebene Datei nicht finden. (os error 2), open './data.json'
return JSON.parse(await Deno.readTextFile(filePath))

at async open (deno:runtime/js/40_files.js:51:17)
at async readFile (deno:runtime/js/40_read_file.js:25:18)
at async Object.readTextFile (deno:runtime/js/40_read_file.js:43:24)
at async loadJsonFile (https://deno.land/x/load_json_file@v1.0.0/mod.ts:22:20)
at async FiatConverter_fromJSON.get_data (https://deno.land/x/currency_converter@v0.3.3/src/convert_fromJSON.ts:7:21)