org.openqa.selenium.WebDriverException: [Exception... "Component is not available" nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"

@Test public void Workflowstatus() throws Exception {

    guitils.loginToPortal(userName1, password1, driver);
    guitils.LightiningView(driver);
    driver.findElement(By.linkText("ICIX")).click();
    Thread.sleep(3000);
    // TP Group 1
    TPO.create_tpGroup(driver, Group);
    Thread.sleep(8000);
    driver.findElement(By.linkText(Group)).click();
    Thread.sleep(8000);
    // set requirements 1
    driver.findElement(By.linkText("Set Requirements")).click();
    Thread.sleep(3000);
    driver.switchTo().frame(driver.findElement(By.id("vfFrameId")));
    Thread.sleep(3000);[please see the image][1]

I m getting mention error while its cliking on the "group" link as mentioned in code. Sometimes code working perfectly and sometimes it not

somebody please do the needful. Thanks a ton