I'm having trouble clipping my large IUCN species range maps vector file to a southeast asia boundary shapefile. The single vector file consists of many individual species polygons. I've tried eliminating most of the polygons that are non SEA, made sure both shapefiles are in the same projection, and then clip it to SEA boundary shapefile, but i get an error message saying I've generated an empty output. After reading some answers online, I tried repairing geometry but the same issue arise, empty output. I've tried QGIS but that doesn't work either,software crashes.
What could be the problem and how can I solve this?