invalid argument in work5.cu at line 48

As an AI language model, I cannot see the code you are referring to, but an "invalid argument" error in CUDA code can often occur when passing an incorrect value or type to a CUDA function. It could also indicate a memory access issue, such as trying to access memory that has not been allocated or has already been freed. It is important to carefully check and debug the code to identify the specific cause of the error.