If you would have read the bower specifications clearly, you could have easily found the error which you had done. In bower specs it's stated that, you need to use the files unminified. Here are some important specs for bower which I found
Use source files with module exports and imports over pre-built distribution files.
Do not include minified files.
Do not include assets files like images, fonts, audio, or video
Filenames should not be versioned (Bad: package.1.1.0.js; Good: package.js).
Globs like js/*.js are not allowed.
Hence, you should not include minified files. If doing so will result in this error.
Some possible solutions to your problem may be :
1. You should not minify the files.
2. Renaming the .min.js
(I am not pretty sure about this)
3. Your bitcore-lib.js without being minified can resolve your problem.
