It's also quite common that a thin strand of old leftover PLA is still in the bowden tube. This then gets compacted around the tip of the fresh filament and causes it to jam. Sometimes it helps to manually push the new filament firmly into the feeder while it's trying to load (I mean FIRM, like, enough to lift the machine).
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Labern 775
Try removing the material out of the machine. If it doesn't come out via change material then turn the machine off and just pull it firmly out.
Cut the filament into a point so it's like a sharpened pencil. Sometimes it can catch on a edge as it enters the nozzle.
try this first as it's the main cause.
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JohnFox 25
The end 50mm of the filament must also be perfectly straight, ( as well as pointed ). The feeder is trying to send the end of the filament into quite a small hole and if it isn't straight it hits the edge instead.
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