Hi everyone. I'm new to this so bare with me here. 

So, I have the TP link RV30 vacuum/mop. I usually do a perimeter check for animal biproducts (if you get my drift?). Anyway, I didn't look hard enough as there was some in a dark corner where light doesn't hit that spot. My cats are very good at going to their litter box but someone closed the door to where there litter box is, so this isn't a regular occurrence for my cats. Anyway, what I couldn't find, my vacuum did. I cleaned the vacuum and when I put it all back together it kept saying that the wheel was suspended. I checked the main wheels and they're clean and free moving. The error kept being repeated and so I thought that maybe there was something under the castor wheel...so I popped that off and it's as clean as a whistle, only now, the wheel won't go back on, no matter how hard I try, it won't stay on. I've only had the vacuum about 2 months and it was brought for me. What can I do to fix this? Any suggestions would be welcomed

Thank you.