How to use the pygmt.exceptions.GMTError function in pygmt

# pylint: disable=missing-docstring
#
# Custom exception types used throughout the library. All exceptions derive
# from GMTError.


class GMTError(Exception):
    """
    Base class for all GMT related errors.
    """


class GMTOSError(GMTError):
    """
    Unsupported operating system.
    """


class GMTCLibError(GMTError):
    """
    Error encountered when running a function from the GMT shared library.
    """


class GMTCLibNotFoundError(GMTCLibError):
    """
    Could not find the GMT shared library.
    """

"""


class GMTCLibNotFoundError(GMTCLibError):
    """
    Could not find the GMT shared library.
    """


class GMTCLibNoSessionError(GMTCLibError):
    """
    Tried to access GMT API without a currently open GMT session.
    """


class GMTInvalidInput(GMTError):
    """
    Raised when the input of a function/method is invalid.
    """


class GMTVersionError(GMTError):
    """
    Raised when an incompatible version of GMT is being used.

# Module level variable to know which figures had their show method
        # called. Needed for the sphinx-gallery scraper.
        SHOWED_FIGURES.append(self)

        if method not in ["static", "external"]:
            raise GMTInvalidInput("Invalid show method '{}'.".format(method))
        if method == "external":
            pdf = self._preview(fmt="pdf", dpi=dpi, anti_alias=False, as_bytes=False)
            launch_external_viewer(pdf)
            img = None
        elif method == "static":
            png = self._preview(
                fmt="png", dpi=dpi, anti_alias=True, as_bytes=True, transparent=True
            )
            if Image is None:
                raise GMTError(
                    " ".join(
                        [
                            "Cannot find IPython.",
                            "Make sure you have it installed",
                            "or use 'external=True' to open in an external viewer.",
                        ]
                    )
                )
            img = Image(data=png, width=width)
        return img

"""


class GMTCLibNoSessionError(GMTCLibError):
    """
    Tried to access GMT API without a currently open GMT session.
    """


class GMTInvalidInput(GMTError):
    """
    Raised when the input of a function/method is invalid.
    """


class GMTVersionError(GMTError):
    """
    Raised when an incompatible version of GMT is being used.

# from GMTError.


class GMTError(Exception):
    """
    Base class for all GMT related errors.
    """


class GMTOSError(GMTError):
    """
    Unsupported operating system.
    """


class GMTCLibError(GMTError):
    """
    Error encountered when running a function from the GMT shared library.
    """


class GMTCLibNotFoundError(GMTCLibError):
    """
    Could not find the GMT shared library.
    """


class GMTCLibNoSessionError(GMTCLibError):
    """
    Tried to access GMT API without a currently open GMT session.
    """