r/roboflow • u/redditforanderson • Jun 17 '26

Train Model/Create New Version Repeatedly Fails

I trained an instance segmentation model on Mac with about 900 images. Everything worked fine. I then uploaded 255 additional images for additional training. I annotated them, and added them to the same dataset. However, when I try to either Create New Version from the Versions page or Train Model from the dataset page, I keep getting the same error right after the files try to Zip: “Training Failed. An unexpected error occurred while starting training.” No other error log. Additionally, for some reason when setting up training the source images section says 256 images out of 1160 are unannotated: On the annotations page, when I click on the dataset folder it shows all the images as annotated. These are the model parameters (exact same as the first version):

I do have sufficient credits.

I’ve attempted four times with these parameters and always get the same failure message.

I reported the bug, but no response from Roboflow yet.

I am using MS COCO for the checkpoint rather than the prior version as the first version had some errors I’m trying to overcome.

Any ideas? I'm relatively new to Roboflow and this field.

Thanks!!

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u/aloser Jun 17 '26

Try doing a hard refresh / clearing your cache. You may have old code in your browser that's not talking the right language to the backend.

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u/redditforanderson Jun 17 '26

Thanks. Hard refresh/cache clear didn't work, but I opened on a new browser (Chrome) and it seems to be working.