'loop' without 'do'
You created a Do loop, but did not properly establish the loop. Do loops begin with an associated Do statement. The following demonstrates the correct structure of a Do loop.
Do [{While | Until} condition]
[statements]
[Exit Do]
[statements]
Loop
Or, you can use this syntax:
Do
[statements]
[Exit Do]
[statements]
Loop [{While | Until} condition]
To correct this error
You may have attempted to delete a Do control structure without removing the Loop statement.
Make sure that the Do loop includes all the necessary parts.