Network – Error using multiple socket addresses – indexing block hashes using rpc

When I try to index and create an array from all the block hashes in the blockchain, I keep getting the following error:

“(WinError 10048) Typically, each socket address (protocol/network address/port) can only be used once.”

        block_counter = 0
        total_blocks = rpc_connection.getblockcount()
        while block_counter < total_blocks:
            block_hash = rpc_connection.getblockhash(total_blocks)
            blockHashArray = np.append(blockHashArray, block_hash)

Are transactions coming from my node causing this error? So how can we solve this problem?