[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["難以理解","hardToUnderstand","thumb-down"],["資訊或程式碼範例有誤","incorrectInformationOrSampleCode","thumb-down"],["缺少我需要的資訊/範例","missingTheInformationSamplesINeed","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["上次更新時間:2025-09-04 (世界標準時間)。"],[],[],null,["# Troubleshoot managing deployed agents\n\nThis document describes how to resolve errors that you might encounter when\n[managing deployed agents](/vertex-ai/generative-ai/docs/agent-engine/manage/overview).\n\nError when filtering the list of agents\n---------------------------------------\n\n**Issue**:\n\nYou receive an error message similar to the following: \n\n InvalidArgument: 400 Provided filter is not valid.\n\n**Possible cause**:\n\nYour filter isn't formatted properly.\n\n**Recommended solution**:\n\nUpdate the formatting of your filter so it's formatted correctly. For example,\nyou might be using the following to filter by display name. This filter isn't\nformatted correctly because it's missing quotation marks: \n\n from vertexai import agent_engines\n\n agent_engines.list(filter=f'display_name={DISPLAY_NAME}')\n\nIn this case, enclose `{DISPLAY_NAME}` in double-quotation marks: \n\n from vertexai import agent_engines\n\n agent_engines.list(filter=f'display_name=\"{DISPLAY_NAME}\"')"]]