src/vs/workbench/services/configuration/common/jsonEditingService.ts/JSONEditingService/toErrorMessage
class JSONEditingService:	private toErrorMessage(error: JSONEditingErrorCode): string {
		switch (error) {
			// User issues
			case JSONEditingErrorCode.ERROR_INVALID_FILE: {
				return nls.localize('errorInvalidFile', "Unable to write into the file. Please open the file to correct errors/warnings in the file and try again.");
			}
			case JSONEditingErrorCode.ERROR_FILE_DIRTY: {
				return nls.localize('errorFileDirty', "Unable to write into the file because the file has unsaved changes. Please save the file and try again.");
			}
		}
	}