Troubleshoot developing an agent

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:

 pip  
show  
langchain-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:

 pip  
install  
langchain-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:

 pip  
show  
langchain-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.