dictionary - value cannot be null
i’m getting an warning value cannot be null for dictionary.bykeyvalues and dictionary.valueatkey nodes. they are still working. the warning on valueatkey is “key” instead of “first.”

[[dictionary null]](https://aws1.discourse-cdn.com/business6/uploads/dynamobim/original/3x/e/b/eb67f11ca22ed2318d779fb23997dc959b6e5655.png "dictionary null")
nvm, i think it might be because i was force running it. i reopened the script and it appears to work.
hatayı buldum. tablomdan 2 alan çekip value değerine yazdırmaya çalıştığım için sanırım bu hata oluştu. value: value değerini value: value.kat\_ad olarak duzeltince sorun düzeldi Check if any of the values in the cells are null.  

If they are you need to modify your code to check for null conditions before using `ToString()`. maybe the person responsible for reporting your answer was offended by some of the suggestions on the page. i have several disabilities, but they are not 'defects' or 'drawbacks' or 'weaknesses' and i am certainly not an 'invalid'. these are words that probably would have been commonplace twenty years ago, but they're no longer really considered to be pc when talking about disability.

and quite why 'incompetency' is listed as a synonym for it is completely beyond me.

"physically challenged" and "differently abled" aren't technically correct for a vast number of disabilities. none of my disabilities challenge me physically in any way whatsoever.

or maybe, just maybe, they were offended that the "wiki" link was wrong. it should be wiktionary, not wikitionary. it's wikipedia's version of a dictionary, and it should rhyme with dictionary. see [creating feedback loops](https://vvvv.org/documentation/creating-feedback-loops).

it’s only the subtype of a datatype. don’t worry about that.

fyi: create an [asstring (value)](https://vvvv.org/documentation/asstring-(value)) and check its sub type for possible subtypes of the datatype “value” hi larry, - - thank you for writing. - - to disable the arrow keys you need to override the onkeydown method:  - - class mypageview : radpageview - { -     protected override void onkeydown(keyeventargs e) -     { -         if (e.keycode == keys.left || e.keycode == keys.right) -         { -             return; -         } -         base.onkeydown(e); -     } - } - - - i hope this information is useful. let me know if you need further assistance. - - regards, - dimitar - telerik by progress - - try our brand new, jquery-free angular 2 components built from ground-up which - deliver the business app essential building blocks - a grid component, - data visualization (charts) and form elements. - Hi BenzZz,



as far as I understand this is a HTML-problem. Try setting the initial value with



```
value=""
```

to an empty string.



Otherwise I can suggest:  

- Open your source code in your browser and see if you have any artifacts from your php parser  

- make sure you have your JavaScript deactivated



I hope that helps, Simon Your function works, but both the IF and the ELSE return an alert message that says its invalid.  

The first part - the IF - should return in the alert box "Valid SSN"  

I am assuming your input should be like this 123-45-1234


but do you need to tell the user the input is valid? Surely the alert should only be displayed if the input is invalid? So the if should return nothing. imho Turns out If I tweked each method 



```
foreach (var dataColumn in readFields.Select(column => new DataColumn(columntypeof(string)) { AllowDBNull = true, DefaultValue = string.Empty }))
{
    csvData.Columns.Add(dataColumn);
}

```

and in the second Method I changed it to use an index rather than column name



```
for (var count = 0; count < table.Columns.Count; count++)
{
    sqlBulkCopy.ColumnMappings.Add(count, count);
}

``` see: <https://feedback.photoshop.com/conversations/lightroom-classic/lightroom-classic-when-trying-to-add-files-to-collections-i-get-this-error-0-attempt-to-compare-two-nil-values/5f9091ea35f40c2520b9ecc4> do you have any add-ons installed? if so, please turn them off and try again. add-ons are known to interfere with duolingo.