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Mastra errors and fixes: 4 guides

Real Mastra failures, each with the error you'll see, the cause and steps that worked. 2 of 4 fixed upstream. Search within Mastra.

Fixed: 2

MastraFixed (verified)
HTTP and Upstash log transports mutate caller-owned records
HTTP and Upstash log transports write a timestamp onto the caller's log object. Frozen records fail with TypeError: Cannot add property time, object is not extensible and are not buffered.
Last checked Oct 19, 2026#state#error-messages2 steps →
MastraFixed (verified)
mastra dev drops workspace-package exports that only tool files import
mastra dev fails at boot when a file under src/mastra/tools/ imports a name from a workspace package that the entry file does not import. The line is SyntaxError: The requested module '…/node_modules/.cache/<pkg>.mjs' does not provide an export named 'X'.
Last checked Oct 19, 2026#setup#tool-calls2 steps →

Unverified: 2

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