I can't find an error in the Java code

[HarrySto]

I wrote the source code for a new application on IOS, when writing there were no errors, but when I ran the code, an error appeared in this place:

var t = readLine()!
var s = readLine()!
var len_s = s.count
var t_lis = Set(t)
var c_s   = Counter(s)
var c_t   = Counter(t_lis[len_s])
var c_res = [String: String]()
var summ  = 0
for e in c_s{
    c_res[e] = [c_s[e], min( c_s[e], c_t[e] )]
    summ += c_res[e][1]}
for i in (t.count-s.count) + 1 {
    if summ == len_s-1{
        print(i)
        break
        
    }
    if t[i] in c_res
            if c_res[t[i]][1] > 0{
            c_res[t[i]][1] -= 1
            summ -= 1
    }
    if i+len_s < t.count && t[i+len_s] in c_res
        if c_res[ t[i+len_s] ][1] < c_res[ t[i+len_s] ][0]{
            c_res[ t[i+len_s] ][1] += 1
            summ += 1
        
    }
    else
    print(-1)
        }

Who can tell what is wrong?
And does anyone know a quality service for code analysis? Which could make one code unique across multiple projects. Thanks in advance!

[dev7060]

I wrote the source code for a new application on IOS, when writing there were no errors, but when I ran the code, an error appeared in this place:

What error?

[HarrySto]

What error?

The whole part of this code does not work and is highlighted in red, the description of the error is missing

[dev7060]

The whole part of this code does not work and is highlighted in red, the description of the error is missing

How do you know the posted code is in Java language? What is the version of JDK? What is the code about? What is highlighted where? What are you doing? What is the environment?

[Alpha Teng]

This is not Java code!