Using the adminAPI

I'm new to this, but I wanted to use the CF adminAPI, so I wrote:

<cfset adminObj = new 'cfide.adminapi.administrator'()>

<cfset result = adminObj.login(

adminUserID = 'admin',

adminPassword = 'HASHED_ADMIN_PASSWORD',

isHashed = true

)>

<cfdump var="#result#" abort="1">

And it reports back: false

I don't want to supply the unhashed value in the code itself, and I used the BIF hash() to hash the actual password (which is supplied in the above as 'HASHED_ADMIN_PASSWORD')  Can anyone help point out to me what I'm doing wrong?