use of undeclared identifier taskresult = vm_readtask vm_address_taddress sizeofbuffer buffer &size;

This error message indicates that the variable "task" has not been declared or defined before it is used in the code.

To fix this error, you need to declare or define the variable "task" before using it in the code. The declaration or definition may be missing from the current file or may be in a different file that needs to be included in the current file.

Additionally, make sure that the variable "task" is of the correct type expected by the vm_read() function.