Problem with installing package metre

I am using MikTeX.
I am trying to install the package metre. Unfortunately I always get errors. I have done exactly what is said in the readme file on CTAN, but when trying to run my file, I get the following error message:

! Argument of mathaccentV has an extra }.
<inserted text> 
                par 
l.1619 edefBreve{breve}
                          
?

I do not know what to do with this. My document does not even have 1619 lines, I only have 261.
Does anyone know how I might fix this issue and use the package metre?

documentclass{article}
usepackage{amsmath}
usepackage{metre}