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
Do...Loop Statement | Exit Statement | For...Next Statement | While...Wend Statement