When I try to prepare a proposal, it says the result is a string and it expected a bool.

I enter:
mnbudget prepare TScherryfarm http://www.dashpay.io/ts.json 15 88000 yL7WTtehXs7w5wsyqGMpkdESM9W1ejHRvi 500 yes

And I get:
value is type str, expected bool (code -1)

Also, I don't know how to say I want to use ix or not, I've tried the following but none of them work. They always give me this:
Correct usage is 'mnbudget prepare proposal-name url payment_count block_start dash_address monthly_payment_dash [use_ix(true|false)]' (code -1)

This is what I've tried:
mnbudget prepare TScherryfarm http://www.dashpay.io/ts.json 15 88000 yL7WTtehXs7w5wsyqGMpkdESM9W1ejHRvi 500 yes false

mnbudget prepare TScherryfarm http://www.dashpay.io/ts.json 15 88000 yL7WTtehXs7w5wsyqGMpkdESM9W1ejHRvi 500 yes use_ix false

mnbudget prepare TScherryfarm http://www.dashpay.io/ts.json 15 88000 yL7WTtehXs7w5wsyqGMpkdESM9W1ejHRvi 500 yes [use_ix(false)]

Nothing seems to work.