Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires mediawiki/mediawiki-codesniffer 42.0.1 (exact version match: 42.0.1 or 42.0.1.0), found mediawiki/mediawiki-codesniffer[dev-master, 0.1.0, ..., v0.12.0, v13.0.0, v14.0.0, v14.1.0, v15.0.0, v16.0.0, v16.0.1, v17.0.0, v18.0.0, v19.0.0, ..., 19.x-dev, v20.0.0, v21.0.0, v22.0.0, v23.0.0, v24.0.0, 25.0.0, v26.0.0, v27.0.0, v28.0.0, v29.0.0, v30.0.0, v31.0.0, v32.0.0, v33.0.0, v34.0.0, v35.0.0, v36.0.0, v37.0.0, v38.0.0, v39.0.0, v40.0.0, v40.0.1, v41.0.0, v42.0.0] but it does not match the constraint.

Process completed with exit code 2.

FailFast: cancelling since parallel instance has failed

The operation was canceled.

FailFast: cancelling since parallel instance has failed