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This document describes how to resolve errors that you might encounter when
developing an agent.
Content generation errors
Issue:
You receive an error message similar to the following:
ValueError: Cannot get the Candidate text.
Response candidate content part has no text.
Possible cause:
This error might be caused by using a version of langchain-google-vertexai
that's not compatible with google-cloud-aiplatform. Version 1.0.2 or later
of langchain-google-vertexai is required. To check which version you're using,
run the following command in your terminal:
pipshowlangchain-google-vertexai
Recommended solution:
Install version 1.0.2 of langchain-google-vertexai. This version includes
the LangChain tool-calling
updates that are required to work with google-cloud-aiplatform. To update your
version of langchain-google-vertexai, run the following command in your
terminal:
pipinstalllangchain-google-vertexai--upgrade
After running the update command, verify that you're using version 1.0.2 or
later by running the following command in your terminal:
pipshowlangchain-google-vertexai
If you're in a notebook instance (for example, Jupyter or Colab or Workbench),
you might need to restart your runtime to use the updated packages.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-29 UTC."],[],[],null,["This document describes how to resolve errors that you might encounter when\n[developing an agent](/vertex-ai/generative-ai/docs/agent-engine/develop/overview).\n\nContent generation errors\n\n**Issue**:\n\nYou receive an error message similar to the following: \n\n ValueError: Cannot get the Candidate text.\n Response candidate content part has no text.\n\n**Possible cause**:\n\nThis error might be caused by using a version of `langchain-google-vertexai`\nthat's not compatible with `google-cloud-aiplatform`. Version `1.0.2` or later\nof `langchain-google-vertexai` is required. To check which version you're using,\nrun the following command in your terminal: \n\n pip show langchain-google-vertexai\n\n**Recommended solution**:\n\nInstall version `1.0.2` of `langchain-google-vertexai`. This version includes\nthe [LangChain tool-calling](https://github.com/langchain-ai/langchain-google/pull/166)\nupdates that are required to work with `google-cloud-aiplatform`. To update your\nversion of `langchain-google-vertexai`, run the following command in your\nterminal: \n\n pip install langchain-google-vertexai --upgrade\n\nAfter running the update command, verify that you're using version `1.0.2` or\nlater by running the following command in your terminal: \n\n pip show langchain-google-vertexai\n\nIf you're in a notebook instance (for example, Jupyter or Colab or Workbench),\nyou might need to restart your runtime to use the updated packages."]]
