Matlab Trackmate gives error

Hello, I just started using Miji and trying to open Trackmate with the sample image gives me an error. Further when i resize the window where the image is loaded this odd thing happens where the borders dont get deleted, as shown in the screenshot. Any ideas how to fix that? Thanks in advance

https://postimg.org/image/5b8c4auzb/

regards

Please note what @ctrueden said in a related discussion:

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after the initial confusion i understood what to do. had to tick the checkbox in the update site list in the ImageJ … it all runs properly now. Thanks.