Answer:

The grammatical error in the sentence is the use of the word "but however."

Explanation:

Both "but" and "however" convey a similar meaning of introducing a contrast or contradiction. Using them together creates redundancy and is grammatically incorrect.

To correct the sentence, you can remove one of the words. For example:

"Anna is an amazing lawyer; however, she has many personal issues that often get in the way of her professional work."

or

"Anna is an amazing lawyer, but she has many personal issues that often get in the way of her professional work."