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I couldn't properly understand the usage of these three function together.

Aggregate function kısmında aşağıdaki kodu yazdığım zaman ;

Remove rows that have NA ArrDelay: temp1

temp1 <- filter(hflights, !is.na(ArrDelay))

Generate summary about ArrDelay column of temp1

summarise(temp1, earliest = min(ArrDelay), average = mean(ArrDelay), latest = max(ArrDelay), sd = sd(ArrDelay))

Keep rows that have no NA TaxiIn and no NA TaxiOut: temp2

temp2 <- filter(hflights, !is.na(TaxiIn), !is.na(TaxiOut))

Print the maximum taxiing difference of temp2 with summarise()

temp2 <- mutate(temp2, taxi_diff = abs(TaxiIn - TaxiOut))
summarise(temp2, max_taxi_diff = max(taxi_diff))

üçüncü kısım ile ilgili şu hatayı alıyorum ;
Incorrect submission
There is something wrong with your code to calculate temp2. Use both !is.na(TaxiIn) and !is.na(TaxiOut) inside filter().

fakat hata nın bu olduğu düşünmüyorum. ipucu aldığım zaman ise ;
Hint
You'll need !is.na() inside filter() to remove observations that have NA variables.
For temp2, you need !is.na() twice in combination with & (or with commas inside filter()).

zaten yaptığımdan farklı bir şey söylemiyor.

sorunun doğru cevabı ise aşağıdaki gibiymiş;

Remove rows that have NA ArrDelay: temp1

temp1 <- filter(hflights, !is.na(ArrDelay))

Generate summary about ArrDelay column of temp1

summarise(temp1,
earliest = min(ArrDelay),
average = mean(ArrDelay),
latest = max(ArrDelay),
sd = sd(ArrDelay))

Keep rows that have no NA TaxiIn and no NA TaxiOut: temp2

temp2 <- filter(hflights, !is.na(TaxiIn), !is.na(TaxiOut))

Print the maximum taxiing difference of temp2 with summarise()

summarise(temp2, max_taxi_diff = max(abs(TaxiIn - TaxiOut)))

doğru cevabı incelediğim zaman ise verilen hata nın (# Keep rows that have no NA TaxiIn and no NA TaxiOut: temp2 ) ile ilgili değil son kısım (Print the maximum taxiing difference of temp2 with summarise()) ile ilgili olduğunu görüyorum. Fakat bu şekilde bile benim yazdığım kodun sonucu (141) ile doğru cevabın sonucu da aynı çıkıyor. Acaba datacamp tan kaynaklanan bir problem mi mevcut yoksa ben mi durumu yanlış anladım ?

Teşekkürler

yukarıdaki kodların ekran alıntıları ;

please do not edit the link above and describe the problem you're having. pasting the code that is not working would be helpful. if you're getting an error message please also paste it here.

I cannot submit any answers for this exercise. I always get a message such that given below:

I don't think it arises from my bad internet connection or due to prolonged waiting on the same page. Because I passed this exercise, did others and came back to this one and it still gives the same error message. It is in this way for 2 days.
So, can you help me to figure out what's happening? What should I do at this point?