input: Write a function to generate a 3X3 array of random integers ranging from 1 to 5 using the NumPy library. The function should return the generated array. If the NumPy library is not available, the function should handle the ImportError gracefully and provide a message indicating that the NumPy library is required.
  
  assert generate_random_array() == "NumPy library is required to execute this function." or generate_random_array().shape == (3, 3) and np.all((1 <= generate_random_array()) & (generate_random_array() <= 5))
output: try:
      import numpy as np
      return np.random.randint(1, 6, (3, 3))
  except ImportError:
      return "NumPy library is required to execute this function."