How to use the vscode.window.showErrorMessage function in vscode

export async function activate(context: ExtensionContext) {

	let extensionInfo = new ExtensionInfo();

	// initialize the instrumentation wrapper
	await initialize(extensionInfo.getId(), extensionInfo.getVersion(), KEY);

	try {
		// activate the extension, but send instrumentation data
		await instrumentOperation("activation", activateWithTelemetry)(context);
	}
	catch (ex) {
		// sadly, the next line never gets triggered, even if the activateWithTelemetry fails
		window.showErrorMessage("There was an error starting the PDDL extension: " + ex.message);
	}
}

async requestLeanpkgConfigure(message: string) {
        const configureItem = 'Run leanpkg configure.';
        const chosen = await window.showErrorMessage(message, configureItem);
        if (chosen === configureItem) {
            await this.configure();
        }
    }

.catch(err => {
      const message =
        "Unable to find a Java 8 or Java 11 installation on this computer. " +
        "To fix this problem, update the 'Java Home' setting to point to a Java 8 or Java 11 home directory";
      outputChannel.appendLine(message);
      outputChannel.appendLine(err);
      window.showErrorMessage(message, openSettingsAction).then(choice => {
        if (choice === openSettingsAction) {
          commands.executeCommand("workbench.action.openSettings");
        }
      });
    });
  commands.executeCommand("setContext", "metals:enabled", true);

}).catch((erro: string) => {
                window.showErrorMessage(erro);
                mergeAdvpl.repository.checkout(branchAtual);
                validaProjeto();
            });
        })