我正在使用blast，但是当我调用它时，会出现以下消息：
:~$ makeblastdb
USAGE
makeblastdb [-h] [-help] [-in input_file] [-input_type type]
-dbtype molecule_type [-title database_title] [-parse_seqids]
[-hash_index] [-mask_data mask_data_files] [-mask_id mask_algo_ids]
[-mask_desc mask_algo_descriptions] [-gi_mask]
[-gi_mask_name gi_based_mask_names] [-out database_name]
[-max_file_sz number_of_bytes] [-logfile File_Name] [-taxid TaxID]
[-taxid_map TaxIDMapFile] [-version]
DESCRIPTION
Application to create BLAST databases, version 2.5.0+
Use '-help' to print detailed descriptions of command line arguments
========================================================================
Error: Argument "dbtype". Mandatory value is missing: `String, `nucl', `prot''
Error: (CArgException::eNoArg) Argument "dbtype". Mandatory value is missing: `String, `nucl', `prot''
有人可以帮我解释一下吗？ 它在MYPATH中