Error when running docker command to generate from Make file.

I am using docker to generate and this runs fine if I manually paste this command into powershell and run it. Now if I create a Make file and try to run the make file, it fails (error is below)

docker run --rm -v ":/local" openapitools/openapi-generator-cli:v6.1.0 generate -i /local/openapi.spec.yaml -c /local/openapi.config.yaml -g dart-dio -o /local/dart-dio-client

Error: [main] ERROR o.o.c.config.CodegenConfigurator - /local/openapi.config.yaml (No such file or directory) [main] ERROR o.o.c.config.CodegenConfigurator - /local/openapi.config.yaml (No such file or directory) Exception in thread "main" java.lang.RuntimeException: Unable to deserialize config file: /local/openapi.config.yaml at org.openapitools.codegen.config.CodegenConfigurator.readDynamicSettings(CodegenConfigurator.java:167) at org.openapitools.codegen.config.CodegenConfigurator.fromFile(CodegenConfigurator.java:89) at org.openapitools.codegen.cmd.Generate.execute(Generate.java:293) at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32) at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66) make: *** [Makefile:17: generate-client-win] Error 1