"Failed to set game mode" with Marvel Rivals

Whenever I try to activate Marvel Rivals in the games tab, an error pops up saying "Failed to set game mode" and the mod list doesn't appear. The full message reads: SetupError: Missing: C:\Program Files (x86)\Steam\steamapps\common\MarvelRivals\MarvelGame\Marvel\Content\Paks\~mods

at C:\Program Files\Black Tree Gaming Ltd\Vortex\resources\app.asar\renderer.js:3062:145

at tryCatcher (C:\Program Files\Black Tree Gaming Ltd\Vortex\resources\app.asar\node_modules\bluebird\js\release\util.js:16:23)

at Promise._settlePromiseFromHandler (C:\Program Files\Black Tree Gaming Ltd\Vortex\resources\app.asar\node_modules\bluebird\js\release\promise.js:547:31)

at Promise._settlePromise (C:\Program Files\Black Tree Gaming Ltd\Vortex\resources\app.asar\node_modules\bluebird\js\release\promise.js:604:18)

at Promise._settlePromise0 (C:\Program Files\Black Tree Gaming Ltd\Vortex\resources\app.asar\node_modules\bluebird\js\release\promise.js:649:10)

at Promise._settlePromises (C:\Program Files\Black Tree Gaming Ltd\Vortex\resources\app.asar\node_modules\bluebird\js\release\promise.js:725:18)

at _drainQueueStep (C:\Program Files\Black Tree Gaming Ltd\Vortex\resources\app.asar\node_modules\bluebird\js\release\async.js:93:12)

at _drainQueue (C:\Program Files\Black Tree Gaming Ltd\Vortex\resources\app.asar\node_modules\bluebird\js\release\async.js:86:9)

at Async._drainQueues (C:\Program Files\Black Tree Gaming Ltd\Vortex\resources\app.asar\node_modules\bluebird\js\release\async.js:102:5)

at Async.drainQueues (C:\Program Files\Black Tree Gaming Ltd\Vortex\resources\app.asar\node_modules\bluebird\js\release\async.js:15:14)

I'd really appreciate any advice on how to fix this. Thanks!