Black Friday is one of the days when retailers would hope for their websites to function smoothly to take advantage of the shopping frenzy. However, for department store Neiman Marcus, luck is not on its side.

Shoppers looking to purchase Black Friday offers on the online store of Neiman Marcus were shown an error message upon accessing the website.

Catchpoint Systems, a company which tracks the web performance of retailers, said that the homepage of the luxury brand has been mostly inaccessible since 8 AM E.T.

The outage of the Neiman Marcus website is the first significant one for Black Friday, according to Catchpoint. Web performance for retailers over Thanksgiving was relatively smooth, the company added.

Neiman Marcus spokeswoman Ginger Reeder said that the retailer is looking into the website outage.

In response to the outage, the retailer has decided that it will be extending its Black Friday sale, with further details to be released soon by the company.

This is the second major tech issue that Neiman Marcus has faced since last year. In January of 2014, Neiman Marcus revealed that it suffered a hacking attack that compromised the credit card information of over a million of its customers.

Catchpoint monitors the websites, both for desktop and mobile, of the top 50 e-commerce retail companies across 23 locations in the United States.

Catchpoint's data, in addition to the outage of the website of Neiman Marcus, also noted slowness on the desktop websites of Newegg and HP. Jet.com also experienced slowness, but for both its desktop and mobile websites.

A Jet.com spokeswoman said that the speed of the company's website has been stable throughout Black Friday. While the website had a minor problem on Thursday, it is operating faster as improvements have been integrated into it over the past few days.

Catchpoint said that the issues with the website of Newegg, meanwhile, reached the peak over the time of 11:30 AM to 12:15PM ET.

The mobile website of Foot Locker also experienced intermittent errors and slowdowns, Catchpoint added.

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