[BUG]: Failed to call transpile: Source dialect must be set before checking transpiler options

[Codeabunga]

Is there an existing issue for this?

• I have searched the existing issues

Category of Bug / Issue

Converter bug

Current Behavior

Cmd: databricks labs lakebridge transpile --source-dialect tsql --input-source src.sql --output-folder out_1 --debug

Output:

14:01:07    DEBUG [d.labs.lakebridge] Setting source_dialect override: 'tsql'
14:01:07    DEBUG [d.labs.lakebridge] Using only transpiler available for dialect 'tsql': 'Morpheus'
14:01:07     INFO [d.labs.lakebridge] Lakebridge will use the Morpheus transpiler.
14:01:07    ERROR [d.l.lakebridge.transpile] Failed to call transpile
Traceback (most recent call last):
  File "/home/dima/.databricks/labs/lakebridge/state/venv/lib/python3.11/site-packages/databricks/labs/blueprint/cli.py", line 118, in _route
    cmd.fn(**kwargs)
  File "/home/dima/.databricks/labs/lakebridge/lib/src/databricks/labs/lakebridge/cli.py", line 131, in transpile
    config, engine = checker.check()
                     ^^^^^^^^^^^^^^^
  File "/home/dima/.databricks/labs/lakebridge/lib/src/databricks/labs/lakebridge/cli.py", line 485, in check
    self._check_transpiler_options(engine)
  File "/home/dima/.databricks/labs/lakebridge/lib/src/databricks/labs/lakebridge/cli.py", line 454, in _check_transpiler_options
    assert self._config.source_dialect is not None, "Source dialect must be set before checking transpiler options."
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: Source dialect must be set before checking transpiler options.
Error: unexpected end of JSON input

During installation the [0] Set it later option was selected for Select the source dialect.

databricks -v
Databricks CLI v0.258.0

cat .databricks/labs/lakebridge/state/version.json
{"version":"v0.10.4","date":"2025-07-15T13:13:30.634008556+02:00"}

Expected Behavior

No response

Steps To Reproduce

No response

Relevant log output or Exception details

Logs Confirmation

• I ran the command line with --debug
• I have attached the lsp-server.log under USER_HOME/.databricks/labs/remorph-transpilers/<converter_name>/lib/lsp-server.log

Sample Query

Operating System

Linux

Version

latest via Databricks CLI