No toolchains found in the NDK toolchains folder for ABI with prefix: mips64el-linux-android

No toolchains found in the NDK toolchains folder for ABI with prefix: mips64el-linux-android

원인 : 오래된 flutter 플젝을 열때 나오는 버그이다. 

Open android/gradle/gradle-wrapper.properties and change this line:

distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip

to this line:

distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip

Open android/build.gradle and change this line:

classpath 'com.android.tools.build:gradle:3.0.1'

to this:

classpath 'com.android.tools.build:gradle:3.1.2'