Here is the fix to “can’t find astdb.txt” (Credit goes to AeroD(in the reviews)
So what you do is create a symbolic link to it. In my case I created the Allmon2 directory with the capital A so the app could not find it.
I created /var/www/html/allmon2/ and linked the astdb.txt file from the Allmon2 directory. This is the only thing that there is in this recently created directory.
Problem solved. Developer lost 1 star because he never replied to my question, which was: where is the app looking for this astdb.txt file?
73, KD2PWR