Power query create a column syntax - help

[rafterse]

I'm getting this error, what am i missing. 
summary 

i want to create a colum that looks at 1 column for text.contains "XXXXX" and the start of another column doesn't start with text "YYYYY_______" then return a result 

[rafterse]

ledgend. thanks so much 

[v-jingzhan-msft]

Hi @rafterse  If @AlienSx 's solution helps, you can accept that reply as Solution. Thanks. 

[AlienSx · Accepted solution]

Table.AddColumn(
    your_table, 
    "LHRR", 
    each 
        if Text.Contains([a], "xxxx") and 
        not Text.StartsWith([b], "yyyy") 
        then "LHRR" 
        else "notLHRR"
)