[Bug] Bug report: New session - 2026-08-13T01:35:57.147Z

System:
Processor: Intel(R) Core(TM) Ultra X7 368H, 2000 Mhz, 16 Core(s), 16 Logical Processor(s)
GPU: Intel ARC B390
Installed Physical Memory (RAM): 64.0 GB @ 9600 MT/s
Gfx Driver: 32.0.101.8864

Observed on SuperClaw v1.2 with full local inferencing mode enabled.

Issue description: When prompting SuperClaw with any request, the following error is shown:

"Unknown Error "{\"error\":{\"code\":400,\"message\":\"Failed to initialize samplers: failed to parse grammar\",\"type\":\"invalid_request_error\"}}"

Reproduce the error in SuperClaw v1.2 with full local inferencing enabled by sending a prompt, then trace the path that reports “Failed to initialize samplers: failed to parse grammar.” Done means ordinary prompts no longer return the unknown-error response, with the affected grammar or sampler case covered by an appropriate check.

Written by the indexing model from the issue text.