NDK Error: "Did not have a source.properties file"

I’m setting up my first Flutter project on Linux Mint (XFCE), and my build fails with an NDK-related error:

[CXX1101] NDK at /home/pc/Android/Sdk/ndk/26.3.11579264 did not have a source.properties file

I’ve installed the required Android SDK and SDK tools as recommended by Flutter, and flutter doctor shows no issues except that I haven’t installed Chrome.

My first time using flutter btw so forgive my ignorance.
And thank you for your feedback.

What is in your build.gradle.kts, line 16?