Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires darryldecode/cart ^4.2 -> satisfiable by darryldecode/cart[4.2.0, ..., 4.2.5]. - darryldecode/cart[4.2.0, ..., 4.2.1] require illuminate/support 5.0.*|5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*|5.8.*|^6.0|^7.0|^8.0 -> found illuminate/support[v5.0.0, ..., v5.8.36, v6.0.0, ..., v6.20.44, v7.0.0, ..., v7.30.6, v8.0.0, ..., v8.83.27] but these were not loaded, likely because it conflicts with another require. - darryldecode/cart 4.2.2 requires illuminate/support 5.0.*|5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*|5.8.*|^6.0|^7.0|^8.0|^9.0 -> found illuminate/support[v5.0.0, ..., v5.8.36, v6.0.0, ..., v6.20.44, v7.0.0, ..., v7.30.6, v8.0.0, ..., v8.83.27, v9.0.0, ..., v9.52.16] but these were not loaded, likely because it conflicts with another require. - darryldecode/cart[4.2.3, ..., 4.2.4] require illuminate/support 5.0.*|5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*|5.8.*|^6.0|^7.0|^8.0|^9.0|^10.0 -> found illuminate/support[v5.0.0, ..., v5.8.36, v6.0.0, ..., v6.20.44, v7.0.0, ..., v7.30.6, v8.0.0, ..., v8.83.27, v9.0.0, ..., v9.52.16, v10.0.0, ..., v10.48.28] but these were not loaded, likely because it conflicts with another require. - darryldecode/cart 4.2.5 requires illuminate/support 5.0.*|5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*|5.8.*|^6.0|^7.0|^8.0|^9.0|^10.0|^11.0 -> found illuminate/support[v5.0.0, ..., v5.8.36, v6.0.0, ..., v6.20.44, v7.0.0, ..., v7.30.6, v8.0.0, ..., v8.83.27, v9.0.0, ..., v9.52.16, v10.0.0, ..., v10.48.28, v11.0.0, ..., v11.44.1] but these were not loaded, likely because it conflicts with another require.