Why am I getting this error when trying to use signal.

For general "Error evaluating formula" issues, try refreshing your browser using Cmd/Ctrl + Shift + R. If you're encountering a "failed to parse body" error with HTTP API enrichments in your Signal, check that text is in quotes, remove extra commas, and verify your data format. For HTTP API body parsing errors, ensure keys are surrounded by double quotes, check punctuation and syntax, and watch for hidden characters. Could you share the specific error message or screenshot you're seeing when trying to use Signal?

Sources: FAQ: Why am I seeing the "failed to parse body" error when using the HTTP API enrichment? HTTP API with JWT authentication | Documentation | Clay University