Because you gave us no clues as to what should be there, here's my best guess...
You've deleted a component major... but it's still in the Component Browser...
Let's guess it's BLU_PHARMACY...Capture.PNG To fix it just [re]insert the missing components back into the model.
If that's not it... then do you have a SKB file - the auto-made previously-saved-version of this SKP. If so rename then you can it, with a new SKP file-extension, and open it in SketchUp, and look in it to see if what's missing is in this earlier saved version...
If not then the only thing you can take away from all of this is to learn to make backup copies at every major turn... protect your data !