warpdotdev/warp · error · DiffError

Command '{}' failed to start: {}

Error message

Command '{}' failed to start: {}

What it means

Error "Command '{}' failed to start: {}" thrown in warpdotdev/warp.

Source

Thrown at script/run-clang-format.py:176

    #   > the client can translate to the relevant code page if needed.
    #   > Each translation completely replaces the format string
    #   > for the diagnostic.
    #   > -- http://clang.llvm.org/docs/InternalsManual.html#internals-diag-translation
    #
    # It's not pretty, due to Python 2 & 3 compatibility.
    encoding_py3 = {}
    if sys.version_info[0] >= 3:
        encoding_py3['encoding'] = 'utf-8'

    try:
        proc = subprocess.Popen(
            invocation,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            universal_newlines=True,
            **encoding_py3)
    except OSError as exc:
        raise DiffError(
            "Command '{}' failed to start: {}".format(
                subprocess.list2cmdline(invocation), exc
            )
        )
    proc_stdout = proc.stdout
    proc_stderr = proc.stderr
    if sys.version_info[0] < 3:
        # make the pipes compatible with Python 3,
        # reading lines should output unicode
        encoding = 'utf-8'
        proc_stdout = codecs.getreader(encoding)(proc_stdout)
        proc_stderr = codecs.getreader(encoding)(proc_stderr)
    # hopefully the stderr pipe won't get full and block the process
    outs = list(proc_stdout.readlines())
    errs = list(proc_stderr.readlines())
    proc.wait()
    if proc.returncode:
        raise DiffError(

View on GitHub (pinned to e72fd7aacb)

When it happens

Trigger: Thrown at script/run-clang-format.py:176 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of warpdotdev/warp@e72fd7aacb (2026-08-16). Data as JSON: /api/errors/8a1c34f43fbd1d31. Report an issue: GitHub.