Process completed with exit code 2.

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires addwiki/mediawiki-api ^3 -> satisfiable by addwiki/mediawiki-api[3.0.0, 3.1.0]. - addwiki/mediawiki-api 3.0.0 requires addwiki/mediawiki-api-base ^3.0 -> satisfiable by addwiki/mediawiki-api-base[3.0.0, 3.1.0]. - addwiki/mediawiki-api 3.1.0 requires addwiki/mediawiki-api-base ^3.1 -> satisfiable by addwiki/mediawiki-api-base[3.1.0]. - addwiki/mediawiki-api-base 3.0.0 requires guzzlehttp/guzzle ~6.3||~7.0 -> satisfiable by guzzlehttp/guzzle[7.12.1, ..., 7.13.2]. - addwiki/mediawiki-api-base 3.0.0 requires guzzlehttp/promises ~1.0 -> satisfiable by guzzlehttp/promises[1.0.0, ..., 1.5.3]. - guzzlehttp/guzzle[7.12.1, ..., 7.13.2] require guzzlehttp/promises ^2.5 -> satisfiable by guzzlehttp/promises[2.5.0]. - Conclusion: don't install addwiki/mediawiki-api-base 3.1.0 (conflict analysis result) - You can only install one version of a package, so only one of these can be installed: guzzlehttp/promises[1.0.0, ..., 1.5.3, 2.5.0].