Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires symfony/framework-bundle ^3.4.34|^4.3|^5.4|^6.4, found symfony/framework-bundle[v3.4.34, ..., v3.4.47, v4.3.0, ..., v4.4.51, v5.4.0, ..., v5.4.31] but these were not loaded, likely because it conflicts with another require. Problem 2 - Root composer.json requires symfony/security-bundle ^3.4.34|^4.3|^5.4|^6.4, found symfony/security-bundle[v3.4.34, ..., v3.4.48, v4.3.0, ..., v4.4.50, v5.4.0, ..., v5.4.31] but these were not loaded, likely because it conflicts with another require. Problem 3 - Root composer.json requires symfony/validator ^3.4.34|^4.3|^5.4|^6.4, found symfony/validator[v3.4.34, ..., v3.4.47, v4.3.0, ..., v4.4.48, v5.4.0, ..., v5.4.31] but these were not loaded, likely because it conflicts with another require. Problem 4 - Root composer.json requires symfony/yaml ^3.4.34|^4.3|^5.4|^6.4, found symfony/yaml[v3.4.34, ..., v3.4.47, v4.3.0, ..., v4.4.45, v5.4.0, ..., v5.4.31] but these were not loaded, likely because it conflicts with another require. Problem 5 - Root composer.json requires paysera/lib-dependency-injection ^1.3.0 -> satisfiable by paysera/lib-dependency-injection[1.3.0]. - paysera/lib-dependency-injection 1.3.0 requires symfony/dependency-injection ^2.3|^3.0|^4.0|^5.0 -> found symfony/dependency-injection[v2.3.0, ..., v2.8.52, v3.0.0, ..., v3.4.47, v4.0.0, ..., v4.4.49, v5.0.0, ..., v5.4.31] but these were not loaded, likely because it conflicts with another require. Problem 6 - paysera/lib-normalization-bundle 1.1.0 requires symfony/framework-bundle ^3.4.26|^4.2.7 -> found symfony/framework-bundle[v3.4.26, ..., v3.4.47, v4.2.7, ..., v4.4.51] but these were not loaded, likely because it conflicts with another require. - paysera/lib-normalization-bundle 1.2.0 requires symfony/framework-bundle ^3.4.26|^4.2.7|^5.4 -> found symfony/framework-bundle[v3.4.26, ..., v3.4.47, v4.2.7, ..., v4.4.51, v5.4.0, ..., v5.4.31] but these were not loaded, likely because it conflicts with another require. - Root composer.json requires paysera/lib-normalization-bundle ^1.1.0 -> satisfiable by paysera/lib-normalization-bundle[1.1.0, 1.2.0].