******************************************************************************** conan install grpc/1.37.0@ --build=grpc --profile=C:\J\w\BuildSingleReference/13733/4dc97891-c069-42fd-b340-46739b89068d/profile.txt ******************************************************************************** Configuration: [settings] arch=x86_64 arch_build=x86_64 build_type=Release compiler=Visual Studio compiler.runtime=MT compiler.version=16 os=Windows os_build=Windows [options] [build_requires] [env] Traceback (most recent call last): File "c:\python36\lib\site-packages\conans\client\command.py", line 2164, in run method(args[0][1:]) File "c:\python36\lib\site-packages\conans\client\command.py", line 536, in install lockfile_node_id=args.lockfile_node_id) File "c:\python36\lib\site-packages\conans\client\conan_api.py", line 93, in wrapper return f(api, *args, **kwargs) File "c:\python36\lib\site-packages\conans\client\conan_api.py", line 560, in install_reference lockfile_node_id=lockfile_node_id) File "c:\python36\lib\site-packages\conans\client\manager.py", line 59, in deps_install lockfile_node_id=lockfile_node_id) File "c:\python36\lib\site-packages\conans\client\graph\graph_manager.py", line 120, in load_graph apply_build_requires=apply_build_requires) File "c:\python36\lib\site-packages\conans\client\graph\graph_manager.py", line 255, in _resolve_graph graph_lock=graph_lock) File "c:\python36\lib\site-packages\conans\client\graph\graph_manager.py", line 365, in _load_graph apply_build_requires=apply_build_requires) File "c:\python36\lib\site-packages\conans\client\graph\graph_manager.py", line 286, in _recurse_build_requires self._binary_analyzer.evaluate_graph(graph, build_mode, update, remotes, nodes_subset, root) File "c:\python36\lib\site-packages\conans\client\graph\graph_binaries.py", line 389, in evaluate_graph self._evaluate_node(node, build_mode, update, remotes) File "c:\python36\lib\site-packages\conans\client\graph\graph_binaries.py", line 176, in _evaluate_node self._process_node(node, pref, build_mode, update, remotes) File "c:\python36\lib\site-packages\conans\client\graph\graph_binaries.py", line 242, in _process_node self._evaluate_cache_pkg(node, package_layout, pref, metadata, remote, remotes, update) File "c:\python36\lib\site-packages\conans\client\graph\graph_binaries.py", line 95, in _evaluate_cache_pkg assert node.prev, "PREV for %s is None: %s" % (str(pref), metadata.dumps()) AssertionError: PREV for c-ares/1.17.1:3f077efc91b140ea11987c89d88f5326bd824bea is None: {"recipe": {"revision": "2317354504764678d37d9ad6a1b6b041", "remote": "conan-center", "properties": {}, "checksums": {"conan_export.tgz": {"md5": "15af19ceea12f073ae9fc833dcdacb55", "sha1": "672ca20ea550551a5f9223ff6100a303a21697d3"}, "conanmanifest.txt": {"md5": "e2131daa44e62a05642473fde414b3f9", "sha1": "90ad1d78b42449d5725f62fd37d557d034f8e316"}, "conanfile.py": {"md5": "0eeaf5fda5190687a6d0b912d1093a1c", "sha1": "721891fb109a90c6193566ed0bd1548fe2971400"}}}, "packages": {"3f077efc91b140ea11987c89d88f5326bd824bea": {"revision": null, "recipe_revision": null, "remote": null, "properties": {}, "checksums": {}}}} ERROR: PREV for c-ares/1.17.1:3f077efc91b140ea11987c89d88f5326bd824bea is None: {"recipe": {"revision": "2317354504764678d37d9ad6a1b6b041", "remote": "conan-center", "properties": {}, "checksums": {"conan_export.tgz": {"md5": "15af19ceea12f073ae9fc833dcdacb55", "sha1": "672ca20ea550551a5f9223ff6100a303a21697d3"}, "conanmanifest.txt": {"md5": "e2131daa44e62a05642473fde414b3f9", "sha1": "90ad1d78b42449d5725f62fd37d557d034f8e316"}, "conanfile.py": {"md5": "0eeaf5fda5190687a6d0b912d1093a1c", "sha1": "721891fb109a90c6193566ed0bd1548fe2971400"}}}, "packages": {"3f077efc91b140ea11987c89d88f5326bd824bea": {"revision": null, "recipe_revision": null, "remote": null, "properties": {}, "checksums": {}}}}