[HOOK - attribute_checker.py] pre_export(): WARN: Conanfile doesn't have 'url'. It is recommended to add it as attribute
[HOOK - conan-center.py] pre_export(): ERROR: [RECIPE METADATA (KB-H003)] Conanfile doesn't have 'url' attribute.  (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H003) 
[HOOK - conan-center.py] pre_export(): WARN: [RECIPE METADATA (KB-H003)] Conanfile doesn't have 'topics' attribute. 
[HOOK - conan-center.py] pre_export(): ERROR: [CMAKE MINIMUM VERSION (KB-H028)] The CMake file 'recipes/pcl/all/CMakeLists.txt' must contain a minimum version declared at the beginning (e.g. cmake_minimum_required(VERSION 3.1.2)) (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H028) 
[HOOK - conan-center.py] pre_export(): ERROR: [CMAKE MINIMUM VERSION (KB-H028)] The CMake file 'recipes/pcl/all/CMakeLists.txt' must contain a minimum version declared at the beginning (e.g. cmake_minimum_required(VERSION 3.1.2)) (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H028) 
[HOOK - conan-center.py] pre_export(): ERROR: [CMAKE MINIMUM VERSION (KB-H028)] The CMake file 'recipes/pcl/all/CMakeLists.txt' must contain a minimum version declared at the beginning (e.g. cmake_minimum_required(VERSION 3.1.2)) (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H028) 
[HOOK - conan-center.py] pre_export(): ERROR: [TEST PACKAGE - NO IMPORTS() (KB-H034)] The method `imports` is not allowed in test_package/conanfile.py (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H034) 
ERROR: [HOOK - conan-center.py] pre_export(): Some checks failed running the hook, check the output