Method invocation is supported only on core types in this language mode: what it means and how to fix it
This story is from 2026-09-29. It is preserved in the archive; the latest stories are on the live feed.
You run one command in your agent CLI. It works. Then a wall of red shows up anyway: Cannot invoke the method. Method invocation is supported only on core types in this language mode. + FullyQualifiedErrorId : MethodInvocationNotSupportedInConstrainedLanguage Exit code 0. The thing you asked for ac…
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- 2026-09-29 02:50 · DEV Community — AI
Method invocation is supported only on core types in this language mode: what it means and how to fix it