I tend to be very hard about errors --- but given that the ball hung for a while, I'd say error. Did the OF have and use sunglasses? Did he use his glove to block the sun in order to track? His not using those tools would make me lean even more to error, while direct sun on a standard fly (or worse, a line drive) would make me lean toward no error.
If the ball did hit the catcher's shin guards first, it was blockable, and even on a dropped strike would have been playable to first. I'd say PB.