mill: Failed resolvedAmmoniteReplIvyDeps - scala

Question

I have following very simple module definition in build.src
import mill._
import mill.bsp.BSP.millSourcePath
import mill.scalalib.{JavaModule, ScalaModule}
object scalaMod0 extends ScalaModule {
override def scalaVersion = "2.13.6"
}
Mill version is 0.9.9
Then I try to run
mill show scalaMod0.resolvedAmmoniteReplIvyDeps
1/1] show interp.watchValue millSourcePath: /home/jk/workspace.exp/hands-on-scala/mill01
[1/1] show > [9/9] scalaMod0.resolvedAmmoniteReplIvyDeps | Downloading [2/2] artifacts (~0/0 bytes)
1 targets failed
show 1 targets failed
scalaMod0.resolvedAmmoniteReplIvyDeps
Resolution failed for 1 modules:
--------------------------------------------
com.lihaoyi:ammonite_2.13.6:2.3.8-65-0f0d597f
not found: /home/jk/.ivy2/local/com.lihaoyi/ammonite_2.13.6/2.3.8-65-0f0d597f/ivys/ivy.xml
not found: https://repo1.maven.org/maven2/com/lihaoyi/ammonite_2.13.6/2.3.8-65-0f0d597f/ammonite_2.13.6-2.3.8-65-0f0d597f.pom
The contents of https://repo1.maven.org/maven2/com/lihaoyi/ammonite_2.13.6 are following:
com/lihaoyi/ammonite_2.13.6
../
2.3.8-122-9be39deb/ 2021-05-17 21:19 -
2.3.8-123-0b9a8c9b/ 2021-05-18 14:20 -
2.3.8-124-2da846d2/ 2021-05-19 04:57 -
2.3.8-125-f6bb1cf9/ 2021-06-08 13:15 -
2.3.8-67-4b6c67db/ 2021-05-17 19:50 -
2.4.0/ 2021-06-08 13:25 -
2.4.0-10-40f87721/ 2021-07-27 12:49 -
2.4.0-11-5b9ff5e7/ 2021-07-27 12:57 -
2.4.0-12-69f45b4b/ 2021-07-27 13:05 -
2.4.0-13-6ffcb9ff/ 2021-07-30 16:49 -
2.4.0-14-4824b429/ 2021-08-02 15:59 -
2.4.0-17-6dbd7856/ 2021-08-30 14:06 -
2.4.0-18-12c9e33e/ 2021-09-01 15:35 -
2.4.0-19-f4790b61/ 2021-09-01 16:24 -
2.4.0-20-f3d8171f/ 2021-09-09 16:33 -
2.4.0-22-a70409dc/ 2021-09-09 23:09 -
2.4.0-23-76673f7f/ 2021-09-16 16:30 -
2.4.0-5-534c9436/ 2021-07-15 18:25 -
2.4.0-6-426d8ae5/ 2021-07-27 10:13 -
2.4.0-9-0017ff97/ 2021-07-27 11:59 -
maven-metadata.xml 2021-09-16 16:32 1175
maven-metadata.xml.md5 2021-09-16 16:32 32
maven-metadata.xml.sha1 2021-09-16 16:32 40
maven-metadata.xml.sha256 2021-09-16 16:32 64
maven-metadata.xml.sha512 2021-09-16 16:32 128
So the requested dir 2.3.8-65-0f0d597f does not exist.
How can I fix this?
Where is this 2.3.8-65-0f0d597f configured or selected? Why does mill want exactly this non-existing ammonite version?
When I start my local installed ammonite, it shows following version information:
amm
Loading...
Welcome to the Ammonite Repl 2.2.0 (Scala 2.13.3 Java 11.0.11)
Thank you for your help!

Answer 1

This is already discussed in the mill discussions forum (https://github.com/com-lihaoyi/mill/discussions/1396).
I'm mostly quoting an adapted version here:
Mill will by default pick the same ammonite version which it uses internally. But as ammonite releases need to match the full Scala version, and the pre-selected ammonite version (2.3.8-65-0f0d597f) wasn't released for Scala 2.13.6, you need to specify another ammonite version by overriding def ammoniteVersion.
For example:
import mill._
import mill.scalalib.ScalaModule
object scalaMod0 extends ScalaModule {
override def scalaVersion = "2.13.6"
override def ammoniteVersion = "2.4.0"
// ...
}