Your requirements could not be resolved to an installable set of packages. Problem 1 - dynamic/silverstripe-elemental-markdown is present at version dev-HEAD and cannot be modified by Composer - Root composer.json requires silverstripe/installer 5.3.x-dev -> satisfiable by silverstripe/installer[5.3.x-dev]. - Root composer.json requires undefinedoffset/silverstripe-markdown ^2.0 -> satisfiable by undefinedoffset/silverstripe-markdown[2.0.0-alpha1, 2.0.0, 2.0.1, 2.x-dev]. - dynamic/silverstripe-elemental-markdown dev-HEAD conflicts with silverstripe/vendor-plugin 1.5.1. - silverstripe/framework[4.0.0-beta4, ..., 4.3.x-dev] require silverstripe/vendor-plugin ^1.0 -> satisfiable by silverstripe/vendor-plugin[1.0.0, ..., 1.x-dev]. - silverstripe/framework[4.4.0-rc1, ..., 4.11.x-dev] require silverstripe/vendor-plugin ^1.4 -> satisfiable by silverstripe/vendor-plugin[1.4.0-beta1, ..., 1.x-dev]. - silverstripe/framework[4.12.0-beta1, ..., 4.x-dev] require silverstripe/vendor-plugin ^1.6 -> satisfiable by silverstripe/vendor-plugin[1.6.0, ..., 1.x-dev]. - silverstripe/installer 5.3.x-dev requires silverstripe/recipe-cms 5.3.x-dev -> satisfiable by silverstripe/recipe-cms[5.3.x-dev]. - silverstripe/installer 5.3.x-dev requires silverstripe/vendor-plugin 2.0.x-dev -> satisfiable by silverstripe/vendor-plugin[2.0.x-dev]. - silverstripe/recipe-cms 5.3.x-dev requires silverstripe/recipe-core 5.3.x-dev -> satisfiable by silverstripe/recipe-core[5.3.x-dev]. - silverstripe/recipe-core 5.3.x-dev requires silverstripe/framework 5.3.x-dev -> satisfiable by silverstripe/framework[5.3.x-dev]. - silverstripe/vendor-plugin[1.0.0, ..., 1.4.1] require composer-plugin-api ^1.1 -> found composer-plugin-api[2.6.0] but it does not match the constraint. - undefinedoffset/silverstripe-markdown 2.0.0-alpha1 requires silverstripe/framework ^4.0@dev -> satisfiable by silverstripe/framework[4.0.0-alpha1, ..., 4.x-dev]. - undefinedoffset/silverstripe-markdown[2.0.0, ..., 2.x-dev] require silverstripe/framework ^4.0 -> satisfiable by silverstripe/framework[4.0.0-alpha1, ..., 4.x-dev]. - You can only install one version of a package, so only one of these can be installed: silverstripe/framework[3.5.0-rc1, ..., 3.x-dev, 4.0.0-alpha1, ..., 4.x-dev, 5.0.0-alpha1, ..., 5.x-dev, 6.0.0-alpha1, 6.0.x-dev, 6.x-dev]. - You can only install one version of a package, so only one of these can be installed: silverstripe/vendor-plugin[1.0.0, ..., 1.x-dev, 2.0.0-alpha1, ..., 2.x-dev].

Your requirements could not be resolved to an installable set of packages. Problem 1 - dynamic/silverstripe-elemental-markdown is present at version dev-HEAD and cannot be modified by Composer - Root composer.json requires silverstripe/installer 5.2.x-dev -> satisfiable by silverstripe/installer[5.2.x-dev]. - Root composer.json requires undefinedoffset/silverstripe-markdown ^2.0 -> satisfiable by undefinedoffset/silverstripe-markdown[2.0.0-alpha1, 2.0.0, 2.0.1, 2.x-dev]. - dynamic/silverstripe-elemental-markdown dev-HEAD conflicts with silverstripe/vendor-plugin 1.5.1. - silverstripe/framework[4.0.0-beta4, ..., 4.3.x-dev] require silverstripe/vendor-plugin ^1.0 -> satisfiable by silverstripe/vendor-plugin[1.0.0, ..., 1.x-dev]. - silverstripe/framework[4.4.0-rc1, ..., 4.11.x-dev] require silverstripe/vendor-plugin ^1.4 -> satisfiable by silverstripe/vendor-plugin[1.4.0-beta1, ..., 1.x-dev]. - silverstripe/framework[4.12.0-beta1, ..., 4.x-dev] require silverstripe/vendor-plugin ^1.6 -> satisfiable by silverstripe/vendor-plugin[1.6.0, ..., 1.x-dev]. - silverstripe/installer 5.2.x-dev requires silverstripe/recipe-cms 5.2.x-dev -> satisfiable by silverstripe/recipe-cms[5.2.x-dev]. - silverstripe/installer 5.2.x-dev requires silverstripe/vendor-plugin 2.0.x-dev -> satisfiable by silverstripe/vendor-plugin[2.0.x-dev]. - silverstripe/recipe-cms 5.2.x-dev requires silverstripe/recipe-core 5.2.x-dev -> satisfiable by silverstripe/recipe-core[5.2.x-dev]. - silverstripe/recipe-core 5.2.x-dev requires silverstripe/framework 5.2.x-dev -> satisfiable by silverstripe/framework[5.2.x-dev]. - silverstripe/vendor-plugin[1.0.0, ..., 1.4.1] require composer-plugin-api ^1.1 -> found composer-plugin-api[2.6.0] but it does not match the constraint. - undefinedoffset/silverstripe-markdown 2.0.0-alpha1 requires silverstripe/framework ^4.0@dev -> satisfiable by silverstripe/framework[4.0.0-alpha1, ..., 4.x-dev]. - undefinedoffset/silverstripe-markdown[2.0.0, ..., 2.x-dev] require silverstripe/framework ^4.0 -> satisfiable by silverstripe/framework[4.0.0-alpha1, ..., 4.x-dev]. - You can only install one version of a package, so only one of these can be installed: silverstripe/framework[3.5.0-rc1, ..., 3.x-dev, 4.0.0-alpha1, ..., 4.x-dev, 5.0.0-alpha1, ..., 5.x-dev, 6.0.0-alpha1, 6.0.x-dev, 6.x-dev]. - You can only install one version of a package, so only one of these can be installed: silverstripe/vendor-plugin[1.0.0, ..., 1.x-dev, 2.0.0-alpha1, ..., 2.x-dev].

Your requirements could not be resolved to an installable set of packages. Problem 1 - dynamic/silverstripe-elemental-markdown is present at version dev-HEAD and cannot be modified by Composer - Root composer.json requires silverstripe/installer 5.1.x-dev -> satisfiable by silverstripe/installer[5.1.x-dev]. - Root composer.json requires undefinedoffset/silverstripe-markdown ^2.0 -> satisfiable by undefinedoffset/silverstripe-markdown[2.0.0-alpha1, 2.0.0, 2.0.1, 2.x-dev]. - dynamic/silverstripe-elemental-markdown dev-HEAD conflicts with silverstripe/vendor-plugin 1.5.1. - silverstripe/framework[4.0.0-beta4, ..., 4.3.x-dev] require silverstripe/vendor-plugin ^1.0 -> satisfiable by silverstripe/vendor-plugin[1.0.0, ..., 1.x-dev]. - silverstripe/framework[4.4.0-rc1, ..., 4.11.x-dev] require silverstripe/vendor-plugin ^1.4 -> satisfiable by silverstripe/vendor-plugin[1.4.0-beta1, ..., 1.x-dev]. - silverstripe/framework[4.12.0-beta1, ..., 4.x-dev] require silverstripe/vendor-plugin ^1.6 -> satisfiable by silverstripe/vendor-plugin[1.6.0, ..., 1.x-dev]. - silverstripe/installer 5.1.x-dev requires silverstripe/recipe-cms 5.1.x-dev -> satisfiable by silverstripe/recipe-cms[5.1.x-dev]. - silverstripe/installer 5.1.x-dev requires silverstripe/vendor-plugin 2.0.x-dev -> satisfiable by silverstripe/vendor-plugin[2.0.x-dev]. - silverstripe/recipe-cms 5.1.x-dev requires silverstripe/recipe-core 5.1.x-dev -> satisfiable by silverstripe/recipe-core[5.1.x-dev]. - silverstripe/recipe-core 5.1.x-dev requires silverstripe/framework 5.1.x-dev -> satisfiable by silverstripe/framework[5.1.x-dev]. - silverstripe/vendor-plugin[1.0.0, ..., 1.4.1] require composer-plugin-api ^1.1 -> found composer-plugin-api[2.6.0] but it does not match the constraint. - undefinedoffset/silverstripe-markdown 2.0.0-alpha1 requires silverstripe/framework ^4.0@dev -> satisfiable by silverstripe/framework[4.0.0-alpha1, ..., 4.x-dev]. - undefinedoffset/silverstripe-markdown[2.0.0, ..., 2.x-dev] require silverstripe/framework ^4.0 -> satisfiable by silverstripe/framework[4.0.0-alpha1, ..., 4.x-dev]. - You can only install one version of a package, so only one of these can be installed: silverstripe/framework[3.5.0-rc1, ..., 3.x-dev, 4.0.0-alpha1, ..., 4.x-dev, 5.0.0-alpha1, ..., 5.x-dev, 6.0.0-alpha1, 6.0.x-dev, 6.x-dev]. - You can only install one version of a package, so only one of these can be installed: silverstripe/vendor-plugin[1.0.0, ..., 1.x-dev, 2.0.0-alpha1, ..., 2.x-dev].

Process completed with exit code 2.