Angular ionic build: Cannot read property 'toLowerCase' of undefined postcss

Question

I'm trying to build my application, but I'm getting this error from Postcss.

Note: the file on '/srv/http/r2-app/styles.e4dd05dfea4b7f17f938.css' does not exist.

[error] TypeError: Cannot read property 'toLowerCase' of undefined
    at /srv/http/r2-app/styles.e4dd05dfea4b7f17f938.css:50691:1
    at hasInherit (/srv/http/r2-app/node_modules/postcss-merge-longhand/dist/lib/canMerge.js:16:39)
    at Array.some (<anonymous>)
    at _default (/srv/http/r2-app/node_modules/postcss-merge-longhand/dist/lib/canMerge.js:23:13)
    at /srv/http/r2-app/node_modules/postcss-merge-longhand/dist/lib/decl/borders.js:234:33
    at mergeRules (/srv/http/r2-app/node_modules/postcss-merge-longhand/dist/lib/mergeRules.js:44:11)
    at /srv/http/r2-app/node_modules/postcss-merge-longhand/dist/lib/decl/borders.js:233:29
    at Array.forEach (<anonymous>)
    at Object.merge (/srv/http/r2-app/node_modules/postcss-merge-longhand/dist/lib/decl/borders.js:231:7)
    at /srv/http/r2-app/node_modules/postcss-merge-longhand/dist/index.js:20:13
    at Array.forEach (<anonymous>)
    at /srv/http/r2-app/node_modules/postcss-merge-longhand/dist/index.js:18:23
    at /srv/http/r2-app/node_modules/postcss/lib/container.js:115:18
    at /srv/http/r2-app/node_modules/postcss/lib/container.js:74:18
    at Root.each (/srv/http/r2-app/node_modules/postcss/lib/container.js:60:16)
    at Root.walk (/srv/http/r2-app/node_modules/postcss/lib/container.js:71:17)
    at Root.walkRules (/srv/http/r2-app/node_modules/postcss/lib/container.js:113:19)

Version details

Answer 1

I was using angular metronic. I got the same error and after a long time I found the wrong code block and commented it. error fixed.

border-width: get($checkbox-config, types, accent, borderWidth) !important;