Design Compilers's Illegal reference error

Hello,

I am running synthesis the following code with Design Compiler (Synopsys) , but I have encountered this error although I did synthesis on Quartus SUCCESSFULLY.

Error: m4k.v:58: invalid symbol single_onehot found in activation expression. (VER-254)

Error: m4k.v:58: Illegal reference to memory single_onehot. (VER-253)

reg [63:0] onehot;

wire [63:0] single_onehot [31:0];

reg [63:0] var_onehot;

integer k;

integer m;

always @(single_onehot) // error this lines

begin: a1

var_onehot = single_onehot[0][NUM_WORDS - 1:0];

for (k = 0; k <= NUM_M4KS_WIDTH - 1; k = k + 1)

for (m = 0; m <= NUM_WORDS - 1; m = m + 1)

var_onehot[m] = var_onehot[m] & single_onehot[k][m];

onehot <= var_onehot;

end

Pls help me how to solve this. Thanks