关于Plyr错误的问题:as.double(y):不能强制类型'S4'到type 'double'的向量

I am upgrading a project I had working previously. This code worked a few months ago, in the meantime I have upgraded R and plyr. I think I was on R1.10 and now I am on R1.35, I am not sure what version of plyr I was running before but my current installed version is 1.2. I am upgrading a project I had working previous