My tablet will not boot in to recovery

I tried to flash TWRP with odin, but now when I try to boot in to recovery, the Samsung logo shows and in the top left it says "could not do normal boot, invalid kernel length" and when I let go of the power button it switches back off. I can still access my normal OS which is stock and unrooted. I have the Samsung Galaxy Tab A6, model number SM-T580.

from Android Forums at AndroidCentral.com - Ask a Question //forums.androidcentral.com/ask-question/758381-my-tablet-will-not-boot-recovery-new-post.html
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