SAN FRANCISCO (AP) — Twitter experienced widespread problems Wednesday as users who tried to post received error messages, the most serious outage in service since Elon Musk bought the platform in October.

It wasn’t immediately clear what caused the outage or if the issues were universal, but for about an hour, many users received an error message saying they «exceeded the daily limit for sending tweets.»

Some users said they could post if they scheduled their tweet to post later instead of immediately.

Later Wednesday, Twitter’s main posting service appeared to be back up and running, but several other features, including direct messages, appeared to be having issues.

More than an hour after the outages began, the company said in one of your verified accounts that he was aware of the issues and was working to fix them.

When trying to retweet someone else’s post, some users were getting an error message: «Sorry! You’ve exceeded your tweet limit. Please try retweeting again tomorrow.»

Twitter does have a daily limit of 2,400 posts per day, according to its websitebut that is a ceiling that few users reach.

Twitter did not immediately respond to a request for additional information about the outage.

Musk buys Twitter for $44 billion and his subsequent decision to eliminate most of the company’s staff made predictions from the beginning that the infrastructure of the site could failBut those predictions had largely not come true before Wednesday.

Downdetector, a website that monitors social media complaints about online service interruptions, presented a sharp spike in Twitter complaints as of 5 pm ET.

NBC News was unable to send tweets from any of its accounts early Wednesday morning and received the tweet limit warning. A scheduled tweet sent through Tweetdeck, a popular Twitter client, worked.

This is a developing story. Please check for updates.