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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _initialize_applicationUiFile():
 """ Initializes the Application ui file. """


    RuntimeGlobals.ui_file = umbra.ui.common.get_resource_path(UiConstants.ui_file)
    if not foundations.common.path_exists(RuntimeGlobals.ui_file):
        raise foundations.exceptions.FileExistsError("'{0}' ui file is not available, {1} will now close!".format(
            UiConstants.ui_file, Constants.application_name))