Errors when building compiler from source

[Its-Kenta]

Multiple errors when attempting to build compiler from source using Bootstrapping Vale ver 2.0.15:

Coordinator/src/main.vale:

[100%] Built target backend
Compiling Coordinator...
Running:
/sbin/java -cp /home/----/Documents/Repositories/Vale/Vale-Ubuntu-0.2.0.15/Frontend.jar dev.vale.passmanager.PassManager build --output_dir build --sanity_check true stdlib=/home/----/Documents/Repositories/Vale/Vale-Ubuntu-0.2.0.15/stdlib/src coordinator=/home/----/Documents/Repositories/Vale/Coordinator/src valecutils=/home/----/Documents/Repositories/Vale/Utils/src
Error: coordinator:/home/----/Documents/Repositories/Vale/Coordinator/src/main.vale:12:5 error S: : Can't use the name mut for a local.
    mut i = i + 1;

Frontend returned error code 22, aborting.
(panic)
Coordinator build failed.

https://github.com/ValeLang/Vale/blob/master/Coordinator/src/main.vale <- mut keyword is still present here?? I believe that was change to set as changing mut to set fixes the problem but then again in Coordinator:

Compiling Coordinator...
Running:
/usr/lib64/openjdk-11/bin/java -cp /home/kenta/Documents/Repositories/Vale/BootstrappingValeCompiler/Frontend.jar dev.vale.passmanager.PassManager build --output_dir build --sanity_check true stdlib=/home/kenta/Documents/Repositories/Vale/BootstrappingValeCompiler/stdlib/src coordinator=/home/kenta/Documents/Repositories/Vale/Coordinator/src valecutils=/home/kenta/Documents/Repositories/Vale/Utils/src
Error: stdlib.command:/home/kenta/Documents/Repositories/Vale/BootstrappingValeCompiler/stdlib/src/command/command.vale:65:50 error T
  handle = launch_command(cmd_array, maybe_cwd.or(""));
Couldn't find a suitable function or(&Opt<str>, str). Rejected candidates:


stdlib:/home/kenta/Documents/Repositories/Vale/BootstrappingValeCompiler/stdlib/src/logic.vale:7:1:
func or(a bool, b bool) bool { a or b }

 Index 0 argument &Opt<str> can't be given to expected parameter bool


Frontend returned error code 22, aborting.
(panic)
Coordinator build failed.

This is as far as I could get building Vale from source on Solus linux.
Could you please rectify those errors? It's impossible to build Vale from source due to this!