concatenation of a str and a str function result (*solved*)

[programandala.net]

One of the tries caused both errors at the same time (string into value and vice versa!):

Code:

    let temp = "Son las "+stringIf(true,":")

The following calculation causes both errors at the same time too:

Code:

dim grade(1 to 10) as string
dim newGrade as ubyte

let grade(i)=stringIf(newGrade<10," ")+str(newGrade)

...:869: Cannot convert string to a value. Use VAL() function
...:869: Cannot convert value to string. Use STR() function

It seems it happens when I try to concatenate a literal string or a string function (like str) with the string output returned by a defined string function.

(I'm using version 1.2.5, I forgot)