[Bug]: Gemini Flash 2.5 Image - Invalid JSON payload with v1.77.2.rc.1

[elabbarw]

What happened?

Getting "invalid JSON payload received" when sending a message to Gemini Flash Image 2.5. Works fine with v1.76.1-nightly

Relevant log output

Error fetching response:Error: 503 data: {"error": {"message": "litellm.ServiceUnavailableError: litellm.MidStreamFallbackError: litellm.BadRequestError: VertexAIException BadRequestError - b'{\n  "error": {\n    "code": 400,\n    "message": "Invalid JSON payload received. Unknown name \\"labels\\": Cannot find field.",\n    "status": "INVALID_ARGUMENT",\n    "details": [\n      {\n        "@type": "type.googleapis.com/google.rpc.BadRequest",\n        "fieldViolations": [\n          {\n            "description": "Invalid JSON payload received. Unknown name \\"labels\\": Cannot find field."\n          }\n        ]\n      }\n    ]\n  }\n}\n'No fallback model group found for original model_group=eit_gemini25flashimage. Fallbacks=[{'imagen-4.0-generate-001': ['imagen-4.0-fast-generate-001', 'eit_imagen3']}]. Received Model Group=eit_gemini25flashimage\nAvailable Model Group Fallbacks=None\nError doing the fallback: litellm.ServiceUnavailableError: litellm.MidStreamFallbackError: litellm.BadRequestError: VertexAIException BadRequestError - b'{\n  "error": {\n    "code": 400,\n    "message": "Invalid JSON payload received. Unknown name \\"labels\\": Cannot find field.",\n    "status": "INVALID_ARGUMENT",\n    "details": [\n      {\n        "@type": "type.googleapis.com/google.rpc.BadRequest",\n        "fieldViolations": [\n          {\n            "description": "Invalid JSON payload received. Unknown name \\"labels\\": Cannot find field."\n          }\n        ]\n      }\n    ]\n  }\n}\n'No fallback model group found for original model_group=eit_gemini25flashimage. Fallbacks=[{'imagen-4.0-generate-001': ['imagen-4.0-fast-generate-001', 'eit_imagen3']}] Original exception: BadRequestError: litellm.BadRequestError: VertexAIException BadRequestError - b'{\n  "error": {\n    "code": 400,\n    "message": "Invalid JSON payload received. Unknown name \\"labels\\": Cannot find field.",\n    "status": "INVALID_ARGUMENT",\n    "details": [\n      {\n        "@type": "type.googleapis.com/google.rpc.BadRequest",\n        "fieldViolations": [\n          {\n            "description": "Invalid JSON payload received. Unknown name \\"labels\\": Cannot find field."\n          }\n        ]\n      }\n    ]\n  }\n}\n'", "type": null, "param": null, "code": "503"}}

Are you a ML Ops Team?

No

What LiteLLM version are you on ?

v1.77.2.rc.1

Twitter / LinkedIn details

No response