deepseek-ai/deepseek-harness · error · FsError

FS_EDIT_NOT_FOUND

FS_EDIT_NOT_FOUND

Error message

cannot edit "${displayPath}": old_string must be non-empty

What it means

Error "cannot edit "${displayPath}": old_string must be non-empty" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/e2b/fs-e2b/src/index.ts:153

function mapError(error: unknown, operation: string, displayPath: string, signal?: AbortSignal): FsError {
  if (error instanceof FsError) return error
  if (signal?.aborted === true || (error instanceof DOMException && error.name === 'AbortError')) {
    return new FsError(`${operation} aborted`, 'FS_ABORTED', { cause: error })
  }
  if (error instanceof FileNotFoundError) {
    return new FsError(`cannot ${operation} "${displayPath}": not found`, 'FS_NOT_FOUND', { cause: error })
  }
  if (/permission denied|operation not permitted/i.test(String(error))) {
    return new FsError(`cannot ${operation} "${displayPath}": permission denied`, 'FS_PERMISSION_DENIED', { cause: error })
  }
  return new FsError(`cannot ${operation} "${displayPath}": ${String(error)}`, 'FS_IO_ERROR', { cause: error })
}

function literalEdit(content: string, request: FsEditRequest, displayPath: string): string {
  const oldString = normalizeLineEndings(request.oldString)
  const newString = normalizeLineEndings(request.newString)
  if (oldString.length === 0) {
    throw new FsError(`cannot edit "${displayPath}": old_string must be non-empty`, 'FS_EDIT_NOT_FOUND')
  }
  let matches = 0
  let offset = 0
  while (true) {
    const found = content.indexOf(oldString, offset)
    if (found < 0) break
    matches += 1
    offset = found + oldString.length
  }
  if (matches === 0) throw new FsError(`cannot edit "${displayPath}": old_string was not found`, 'FS_EDIT_NOT_FOUND')
  if (!request.replaceAll && matches !== 1) {
    throw new FsError(`cannot edit "${displayPath}": old_string matched ${matches} times`, 'FS_AMBIGUOUS_EDIT')
  }
  return request.replaceAll ? content.split(oldString).join(newString) : content.replace(oldString, newString)
}

/** Remote filesystem backend sharing the sandbox owned by `ctx.e2b`. */
export class E2BFileSystem extends FileSystem {

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/e2b/fs-e2b/src/index.ts:153 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/2990a5e0bc57a8f2. Report an issue: GitHub.