"x or y has vectors with zero standard deviation; consider setting use_nan = TRUE"
"x or y has vectors with all zero; consider setting use_nan = TRUE"

Error in `proxy(x, y, margin, method, min_proxy = min_simil, rank = rank, 
    drop0 = drop0, diag = diag, use_nan = use_nan, digits = digits)`: proxyC.threads must be an integer