This can be for the following reasons: 
            
            
               
               - Not enough parameters have been specified in order for the operation to be processed. For example, you have tried to start
                  the Fileshare Server without giving a server name. 
               
- The parameters specified do not indicate a valid operation that can be carried out. For example, the combination /s and /r is invalid as the first implies that the Fileshare Server is to start with the server name indicated, whereas the second
                  parameter indicates that a Rollforward Recovery is to be performed. 
               
               
               Resolution:
               
               Ensure that the parameters specified are correct and retry the operation.