This compiler error will occur if you use anything else than an expression which evaluates to an integer, as the starting point of a for loop.

For example:

for nCtr = bOne to 3 step 1 // bOne is not integer
for nCtr = '3' to 10 step 1 // '3' is not integer

See also: step value of for loop should be an integer expression.

Topic 108126, last updated on 18-Apr-2020