Well you probably ground the filament at the feeder. Try pulling it out backwards a bit (while nozzle at 150C) and examine the filament. If I'm right then you either have too many retractions or maybe you were printing too fast. Please post a photo of the print you were printing (I want to see how many retractions it is likely to have on a layer) and post all your cura settings somewhere (best to do "save profile" and just post that entire ini file).
You're not really giving much info to try and figure out what could have gone wrong. Perhaps you can describe your problem a bit more detailed? What filament are you using - PLA or ABS or something else? I assume its not brown filament, so next question should be: How high did you set the nozzle temperature? What did you / the print do before this happened, did you notice anything unusual? Is this a brand new printer or has it been printing for hundreds of hours already?
A tiny bit of gooey brown residue stuff sticking to the side of the nozzle is no biggie. But if you got half a pound of brown gooey stuff there, chances are there's something wrong.
Meanwhile: I guess it won't hurt to try and do an "atomic" to clean your nozzle.. Maybe that'll get you sorted already: https://ultimaker.com/en/resources/19510-atomic-method
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