Yes. If a fund manager resigns due to fund losses, he can sue because the fund manager, as the subject of the contract, promises investors that the loss will be made up by the management company, and the company will sue according to normal civil procedures. If the subject of the contract is the manager's shareholders or other third parties providing guarantees to investors, it is also normal for the counterparty to sue the contract in court, demanding that they perform their duties in accordance with the contract.