Make sure that the CSV file has model in one column and MSRP in other with respective titles. Price should be only a numeric value. If there is any format or formula in the sheet you'll see error after uploading.

Ex. SKU -> A, MSRP -> B, PP1 -> C, PP2 -> D,Stock -> E (Stock Required only if Inventory update),Rebate -> F,Instore Price -> G,Price Tag -> H