Incorrect error message for the add command. When addTask is inputted in the command line without following the correct format, the error message produced is wrong. There should be a spacing between the deadline (-b 2021-05-02) and the task status (-s completed)

Incorrect error message for the add command. When addTask is inputted in the command line without following the correct format, the error message produced is wrong. There should be a spacing between the deadline (-b 2021-05-02) and the task status (-s completed)
