Despite a sharper third season and a slew of notable guest stars, truTV has decided to cancel the Denver-set sitcom “Those Who Can’t.”

That’s according to its co-stars, Adam Cayton-Holland, Andrew Orvedahl and Ben Roy, who took to social media today to reveal the bad news to fans.

“And that’s a wrap on #ThoseWhoCant,” Cayton-Holland wrote on Twitter Wednesday morning. “From the bottom of our hearts, thank you to everyone involved with the show and to everyone who ever watched. I couldn’t be prouder of the three seasons of television we made and the world we created. Smoot High Forever!”

And that’s a wrap on #ThoseWhoCant. From the bottom of our hearts, thank you to everyone involved with the show and to everyone who ever watched. I couldn’t be prouder of the three seasons of television we made and the world we created. Smoot High Forever! pic.twitter.com/Pcyw0f5gfT — Adam Cayton-Holland (@CaytonHolland) April 24, 2019

Cayton-Holland, Orvedahl and Roy, also known as the Grawlix comedy troupe, met and hatched the idea for “Those Who Can’t” in Denver before selling it to Amazon Studios and, later, truTV. The show follows them and co-star Maria Thayer as they play inept, spirited teachers at Denver’s fictional Smoot High School.

Regulars on the show included stand-up buddies such as Rory Scovel (Principal Geoffrey Quinn), Kyle Kinane (Rod Knorr) and Patton Oswalt (Denver mayor Gil Nash), as well as Sonya Eddy (Tammy) and Cheri Oteri (Cattie Goodman) in supporting roles. Guest stars ran the gamut from recognizable film-and-TV faces Sarah Michelle Gellar and Peter Stormare to Mark Hoppus (Blink-182) and Henry Rollins.

“It’s definitely a bummer,” Roy said in an emotional video posted on his Twitter account. “We’ve been doing the show in one way or another for six and a half years.”

When it debuted on truTV, some critics (including this one) hailed the show as an example of a national-quality product being sourced from somewhere other than Los Angeles or New York City. Although the sitcom was filmed in Los Angeles, Cayton-Holland continued to live here between production duties and run his Denver-based High Plains Comedy Festival, while Orvedahl and Roy decamped to Los Angeles.

The show was reviewed positively upon its 2016 premiere, but the more than two-year gap between the second and third seasons had fans (and even the show’s creators) wondering if truTV would renew it. “Those Who Can’t” represented truTV’s first experiment with a scripted series. The Turner-owned network has since followed with shows like “I’m Sorry” and “Tacoma FD.”

“The last thing you saw our characters do on #ThoseWhoCant was run off towards the sound of an ice cream truck. Like children,” Cayton-Holland wrote on Twitter. “We didn’t know that would be the final moment of the series, but it’s actually kind of perfect.”

“It was a dream job, and you don’t get too many of those in life,” Orvedahl wrote on Twitter Wednesday.