unsued variable warning

[dia2e2]

Anyone knows why I keep getting this error.

make -C /lib/modules/5.15.0-52-generic/build M=/home/alex/findtask modules
make[1]: Entering directory '/usr/src/linux-headers-5.15.0-52-generic'
warning: the compiler differs from the one used to build the kernel
  The kernel was built by: gcc (Ubuntu 11.2.0-19ubuntu1) 11.2.0
  You are using:           gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0
  CC [M]  /home/alex/findtask/findTask2.o
/home/alex/findtask/findTask2.c: In function ‘mytimer_callback’:
/home/alex/findtask/findTask2.c:20:21: warning: unused variable ‘task’ [-Wunused-variable]
   20 | struct task_struct *task;
      |                     ^~~~
In file included from ./include/linux/kernel.h:19,
                 from ./include/linux/list.h:9,
                 from ./include/linux/module.h:12,
                 from /home/alex/findtask/findTask2.c:1:
/home/alex/findtask/findTask2.c: In function ‘findTask2_init’:
/home/alex/findtask/findTask2.c:27:58: error: expected expression before ‘->’ token
   27 | printk(KERN_INFO "Found process %s with pid %d\n", name, ->pid);
      |                                                          ^~
./include/linux/printk.h:422:33: note: in definition of macro ‘printk_index_wrap’
  422 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
      |                                 ^~~~~~~~~~~
/home/alex/findtask/findTask2.c:27:1: note: in expansion of macro ‘printk’
   27 | printk(KERN_INFO "Found process %s with pid %d\n", name, ->pid);
      | ^~~~~~
make[2]: *** [scripts/Makefile.build:297: /home/alex/findtask/findTask2.o] Error 1
make[1]: *** [Makefile:1900: /home/alex/findtask] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.15.0-52-generic'
make: *** [Makefile:4: all] Error 2