Minimize() and Maximize() prompt "illegal operation" about cvxr HOT 2 CLOSED

> x <- Variable(1)
> y <- Variable(1)
> objective <- Minimize(x^2 + y^2)
> sessionInfo()
R version 4.2.1 (2022-06-23)
Platform: x86_64-apple-darwin21.5.0 (64-bit)
Running under: macOS Monterey 12.4

Matrix products: default
BLAS:   /usr/local/Cellar/openblas/0.3.20/lib/libopenblasp-r0.3.20.dylib
LAPACK: /usr/local/Cellar/r/4.2.1/lib/R/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] CVXR_1.0-10

loaded via a namespace (and not attached):
 [1] bit_4.0.4       compiler_4.2.1  R6_2.5.1        Matrix_1.4-1   
 [5] gmp_0.6-5       Rcpp_1.0.8.3    bit64_4.0.5     grid_4.2.1     
 [9] Rmpfr_0.8-9     lattice_0.20-45