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

Done installing android
Uno 1.8.1 (build 6782) Windows 10 x64 808e37c
Copyright (C) 2015-2018 Fusetools

Configuring
1.89 s
Compiling syntax tree
1.40 s
Generating code and data
14.46 s
Building Android app

FAILURE: Build failed with an exception.

  • What went wrong:
    A problem occurred configuring project ‘:app’.

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

  • Try:
    Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

(unknown): E0200: Android build failed

fuse: Errors were encountered while building the project
Incremental java compilation is an incubating feature.

BUILD FAILED

Total time: 5.858 secs
7.19 s

Build completed in 24.95 seconds
1 error

You were installing the old uno, seems like you need older NDK: Oct 2018 - Fresh install of Android with fuse 1.9.0 on Windows 10 64bit