.. _error-code-evrf065: .. meta:: :description: AWS Neuron SDK Graph Compiler error code documentation for error EVRF065. NCC_EVRF065 =========== **Error message**: NKI kernel '' was traced with an unsupported NKI version. This error occurs when the compiler detects a NKI (Neuron Kernel Interface) kernel that was traced with an older, incompatible version of NKI. These legacy kernels are missing required metadata that the current compiler expects. Why this happens ----------------- NKI kernels are traced and compiled into intermediate artifacts by the NKI toolchain. When NKI traces a kernel, it records metadata alongside the kernel binary. Newer versions of the compiler require metadata fields that were not present in older NKI versions. If the compiler encounters a kernel artifact that lacks these fields, it cannot safely compile the kernel and raises NCC_EVRF065. Common causes -------------- - The NKI kernel was traced with an earlier version of the NKI toolchain and is being compiled with a newer compiler release. - A cached or serialized model graph contains stale NKI kernel references from an older environment. - The ``neuronxcc`` package was upgraded but the NKI kernels were not retraced. Resolution ----------- 1. **Upgrade the installed NKI version** to the latest release compatible with your compiler version. .. code-block:: bash pip install --upgrade nki neuronx-cc==2.* --extra-index-url=https://pip.repos.neuron.amazonaws.com You can confirm the installed version afterwards with: .. code-block:: bash pip show nki 2. **Retrace your model** to regenerate the NKI kernel artifacts with the updated toolchain. For example, re-run your model's compilation or tracing step so that all NKI kernels are recompiled with the current NKI version. 3. **Clear any cached artifacts** from previous runs to ensure stale kernel binaries are not reused.