Final answer:
The error is in the for-loop condition which uses 'i <= 8' to access an array of size 8, allowing out-of-bounds access to the array.
Step-by-step explanation:
The error in the provided code snippet is in the condition of the for-loop. An array of size 8 in C language has indices ranging from 0 to 7.
However, the loop condition uses i <= 8, which attempts to access an element at index 8, resulting in accessing memory beyond the array's bounds. The correct condition should be i < 8.