Slicer5 - Object is not manifold solid

Hi guys, I tried to use the Slicer5 plugin on this model and it said that the object is not manifold solid. I used to “find edge gaps” tool and it said that there were no open ends. Would appreciate any help on this, thank you, guys! File below.
model problem.skp (776.0 KB)

model problem (SU 2017).skp (348.9 KB)

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hi, thank you, I have downloaded the solid inspector plug in and corrected the mistakes!