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Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires larastan/larastan ^2.0|^3.0 -> satisfiable by larastan/larastan[2.0.0, ..., 2.x-dev, v3.0.0, ..., 3.x-dev]. - Root composer.json requires laravel/framework 12.* -> satisfiable by laravel/framework[12.x-dev]. - illuminate/support[v10.17.0, ..., 10.x-dev] require illuminate/contracts ^10.0 -> found illuminate/contracts[v10.0.0, ..., 10.x-dev] but it conflicts with your root composer.json require (^11.0|^12.0). - illuminate/support[v9.51.0, ..., 9.x-dev] require illuminate/contracts ^9.0 -> found illuminate/contracts[v9.0.0-beta.1, ..., 9.x-dev] but it conflicts with your root composer.json require (^11.0|^12.0). - larastan/larastan[2.0.0, ..., 2.3.5] require illuminate/contracts ^9 -> found illuminate/contracts[v9.0.0-beta.1, ..., 9.x-dev] but it conflicts with your root composer.json require (^11.0|^12.0). - larastan/larastan[2.4.0, ..., v2.6.4] require illuminate/contracts ^9.47.0 || ^10.0.0 -> found illuminate/contracts[v9.47.0, ..., 9.x-dev, v10.0.0, ..., 10.x-dev] but it conflicts with your root composer.json require (^11.0|^12.0). - larastan/larastan[v2.6.5, ..., v2.7.0] require illuminate/contracts ^9.52.16 || ^10.28.0 -> found illuminate/contracts[v9.52.16, 9.x-dev, v10.28.0, ..., 10.x-dev] but it conflicts with your root composer.json require (^11.0|^12.0). - larastan/larastan[v2.9.9, ..., 2.x-dev] require illuminate/support ^9.52.16 || ^10.28.0 || ^11.16 -> satisfiable by illuminate/support[v9.52.16, 9.x-dev, v10.28.0, ..., 10.x-dev, v11.16.0, ..., 11.x-dev]. - larastan/larastan[v2.8.0, ..., v2.9.8] require illuminate/support ^9.52.16 || ^10.28.0 || ^11.0 -> satisfiable by illuminate/support[v9.52.16, 9.x-dev, v10.28.0, ..., 10.x-dev, v11.0.0, ..., 11.x-dev]. - larastan/larastan[v3.0.0, ..., 3.x-dev] require illuminate/support ^11.15.0 -> satisfiable by illuminate/support[v11.15.0, ..., 11.x-dev]. - Only one of these can be installed: illuminate/support[v11.0.0, ..., 11.x-dev, 12.x-dev], laravel/framework[12.x-dev]. They all replace spatie/once and thus cannot coexist.