Setting arguments in a kernel in OpenCL causes error

I am a beginner in OpenCL and thus writing a simple program to double the elements of an array. The kernel code is:-

__kernel void dataParallel(__global int* A, __global int* B)
{
    int base = get_local_id(0);
    B[base]=A[base]+A[base];
}

The local_work_size=32 as I am squaring 32 elements.

In my program I have declared an integer array which holds the elements to be squared.

int *A;
A=(int*)malloc(sizeof(int)*64);
for (i=0; i < 32; i++) {            A[i] = i;   }

platforms[i] stores the platform id, devices[j] stores the corresponding device id. Their types:

cl_platform_id* platforms;
cl_device_id* devices;

Creating context

cl_context context=clCreateContext(NULL,1,&devices[j],NULL,NULL,NULL);

Next comes the command queue

cl_command_queue cmdqueue=cmdqueue=clCreateCommandQueue(context,devices[j],NULL,&err);

Next I created 2 memory buffers, one to hold the input data and the other to hold the result.

cl_mem  Abuffer,Bbuffer;
Abuffer=clCreateBuffer(context, CL_MEM_READ_WRITE ,32*sizeof(int),NULL,&err);
Bbuffer=clCreateBuffer(context, CL_MEM_READ_WRITE ,32*sizeof(int),NULL,&err);

Then I copied the data of array A to Abuffer

ret=clEnqueueWriteBuffer(cmdqueue, Abuffer, CL_TRUE, 0, 32*sizeof(int), A, 0, NULL, NULL);
printf("%d",ret);//output is 0 thus data written successfully into the buffer

The kernel code was then read into a character string source_str and the program was created.

kernelprgrm=clCreateProgramWithSource(context,1,(const char **)&source_str,(const size_t *)&source_size,&err);
    if(!err)
    {
        printf("\nKernel program created successfully\n");
    }//Outputs -Kernel program created successfully

I then built the program using:

ret=clBuildProgram(kernelprgrm,1,&devices[i],NULL,NULL,NULL);//returns CL_SUCCESS

Getting buildinfo next

ret=clGetProgramBuildInfo(kernelprgrm,devices[j], CL_PROGRAM_BUILD_STATUS ,0,NULL,&size);//Returns success

Creating kernel

kernel = clCreateKernel(kernelprgrm, "dataParallel", &ret);
    printf("\nReturn kernel program=%d",ret);
    if(!ret)
    {
        printf("\nProgram created successfully!\n");
    }
    //Outputs -Program created successfully!

Now comes the devil:-

ret=clSetKernelArg(kernel,0,sizeof(cl_mem),(void *) Abuffer);
printf("\nKernel argument 1 ret=%d",ret);

ret=clSetKernelArg(kernel,1,sizeof(cl_mem),(void *) Bbuffer);
printf("\nKernel argument 2 ret=%d",ret);

Both return -38 meaning CL_INVALID_MEM_OBJECT.

P.S.:As per the errors pointed out i.e. use &Abuffer instead of Abuffer in the argument, both return 0

Also ret=clEnqueueTask(cmdqueue,kernel,NULL,NULL,NULL); returns 0.

Trying to get the result

ret = clEnqueueReadBuffer(cmdqueue, Bbuffer, CL_TRUE, 0, 32*sizeof(int), B, 0, NULL, NULL);` 
printf("\nB:-\n");
for (t=0; t < 32; t++) {
            printf("%d\t ", B[t]);
                }

This prints garbage values! While ret = clEnqueueReadBuffer(cmdqueue, Abuffer, CL_TRUE, 0, 32*sizeof(int), A, 0, NULL, NULL); returns the Array A successfully.