FoundationAgents/OpenManus · error · ToolError

Invalid `view_range`: {view_range}. Its first element `{init

Error message

Invalid `view_range`: {view_range}. Its first element `{init_line}` should be within the range of lines of the file: {[1, n_lines_file]}

What it means

Error "Invalid `view_range`: {view_range}. Its first element `{init_line}` should be within the range of lines of the file: {[1, n_lines_file]}" thrown in FoundationAgents/OpenManus.

Source

Thrown at app/tool/str_replace_editor.py:258

        """Display file content, optionally within a specified line range."""
        # Read file content
        file_content = await operator.read_file(path)
        init_line = 1

        # Apply view range if specified
        if view_range:
            if len(view_range) != 2 or not all(isinstance(i, int) for i in view_range):
                raise ToolError(
                    "Invalid `view_range`. It should be a list of two integers."
                )

            file_lines = file_content.split("\n")
            n_lines_file = len(file_lines)
            init_line, final_line = view_range

            # Validate view range
            if init_line < 1 or init_line > n_lines_file:
                raise ToolError(
                    f"Invalid `view_range`: {view_range}. Its first element `{init_line}` should be "
                    f"within the range of lines of the file: {[1, n_lines_file]}"
                )
            if final_line > n_lines_file:
                raise ToolError(
                    f"Invalid `view_range`: {view_range}. Its second element `{final_line}` should be "
                    f"smaller than the number of lines in the file: `{n_lines_file}`"
                )
            if final_line != -1 and final_line < init_line:
                raise ToolError(
                    f"Invalid `view_range`: {view_range}. Its second element `{final_line}` should be "
                    f"larger or equal than its first `{init_line}`"
                )

            # Apply range
            if final_line == -1:
                file_content = "\n".join(file_lines[init_line - 1 :])
            else:

View on GitHub (pinned to 52a13f2a57)

Solutions

1. Set the first element of `view_range` to a value within [1, number_of_lines] as reported in the error message.
2. View the file without `view_range` first to learn its length.

When it happens

Trigger: Raised when the first element of `view_range` is outside the file's line range of 1 to the number of lines in the file.

Common situations: See trigger scenarios.

AI-assisted analysis of FoundationAgents/OpenManus@52a13f2a57 (2026-08-15). Data as JSON: /api/errors/f4cd9dc3d55755af. Report an issue: GitHub.