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This page describes how to fix a chart on your report that displays an "Invalid field name error."
Why it breaks
Certain connectors support characters in their field names that Looker Studio is unable to process. For example, Looker Studio does not handle BigQuery fields that contain Unicode characters and special characters including ampersands, colons, among other characters.
[[["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,["# Resolve invalid field name errors\n\nThis page describes how to fix a chart on your report that displays an \"Invalid field name error.\"\n\nWhy it breaks\n-------------\n\nCertain connectors support characters in their field names that Looker Studio is unable to process. For example, Looker Studio does not handle BigQuery fields that contain Unicode characters and special characters including ampersands, colons, among other characters.\n\n[Learn more about BigQuery flexible column names](/bigquery/docs/schemas#flexible-column-names).\n\nSolution\n--------\n\nTo resolve this issue, rename the fields from the underlying dataset and then [reconnect](/looker/docs/studio/edit-the-data-source-connection) the data source."]]
