CSV file importing results in incorrect location

[SumonMojumder]

Hi, I have imported CSV file (hospital location data) in ArcMap. The dataset has latitude and longitude values and there is no null values. After importing, I found the locations are incorrect (placed in wrong place).  I checked the coordinate system, but found nothing wrong. Then I tried using Project tool to specify a coordinate system, however, the project tool showed me the following error. Can you please tell me whats wrong"?