FTS5 Custom Tokenize

[bluedaquiri]

let simpleTok = FMSimpleTokenizer(locale: nil)
FMDatabase.registerTokenizer(simpleTok)
db.installTokenizerModule(withName: "tokenizer1")

SQL1: CREATE VIRTUAL TABLE IF NOT EXISTS 'Test' USING fts5(title, body, tokenize = 'tokenizer1')
SQL2: CREATE VIRTUAL TABLE IF NOT EXISTS 'Test' USING fts4(title, body, tokenize = 'tokenizer1')

When i use FTS5 in FMDB，I get an error like "no such tokenizer: tokenizer1". (SQL1)
But it is succeed in FT4.(SQL2), how can i work it in FT5?