# Windows Loop Start Error

**URL:** <https://forum.knime.com/t/windows-loop-start-error/39932>\
**Category:** KNIME Analytics Platform\
**Tags:** bug\
**Created:** [February 17, 2022, 1:47pm UTC](https://forum.knime.com/t/windows-loop-start-error/39932 "2022-02-17T13:47:43Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![gprandelli009](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/g/a9a28c/32.png) [@gprandelli009](https://forum.knime.com/u/gprandelli009)\
**Post date:** [February 17, 2022, 1:47pm UTC](https://forum.knime.com/t/windows-loop-start-error/39932/1 "2022-02-17T13:47:43Z")

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Hi everyone, I apologize for the inconvenience but I have an issue with the node Windows Loop Start. I created a variable of the time-stamp type (later I also tried with the string format) which is supposed to be the day from which the loop starts, but inserting it as “start”, the day of the first row of the table is still taken instead. Otherwise if I check the “Start at” option i receive the following error message:  
Execute failed: class java.time.LocalDate cannot be cast to class java.time.LocalDateTime (java.time.LocalDate and java.time.LocalDateTime are in module java.base of loader ‘bootstrap’)

How can I pass the starting day for the loop as a variable?  
I attach the images of the variable that I pass

 ![Screenshot (137)](https://forum-cdn.knime.com/uploads/default/original/3X/d/6/d637eb9425971bc5c79d38eb823acc6bd9f4b050.png)  
 ![Screenshot (136)](https://forum-cdn.knime.com/uploads/default/original/3X/b/0/b06515f3f3be3455ae732e5975276bf1e5163036.png)

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**Author:** ![elsamuel](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/e/b4bc9f/32.png) [@elsamuel](https://forum.knime.com/u/elsamuel)\
**Post date:** [February 17, 2022, 3:22pm UTC](https://forum.knime.com/t/windows-loop-start-error/39932/2 "2022-02-17T15:22:09Z")

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Welcome to the forum @gprandelli009.

What does the data in your Timestamp column look like?

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**Author:** ![gprandelli009](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/g/a9a28c/32.png) [@gprandelli009](https://forum.knime.com/u/gprandelli009)\
**Post date:** [February 17, 2022, 3:38pm UTC](https://forum.knime.com/t/windows-loop-start-error/39932/3 "2022-02-17T15:38:35Z")

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Hi @elsamuel, thanks for the welcome!  
The data in my Timestamp column are in the format “year-mounth-day”  
 ![Screenshot (138)](https://forum-cdn.knime.com/uploads/default/original/3X/8/9/890b3c414dd7b35d7279a02bb343af46a3d7a7c3.png)

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**Author:** ![gprandelli009](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/g/a9a28c/32.png) [@gprandelli009](https://forum.knime.com/u/gprandelli009)\
**Post date:** [February 17, 2022, 3:43pm UTC](https://forum.knime.com/t/windows-loop-start-error/39932/4 "2022-02-17T15:43:12Z")

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Sorry my bad, after your replay i got a doubt and checked my workflow and i wasn’t using the right TimeStamp column. In fact I was using another column in the format “year-mount-day-hour-etc…”  
now my project works just fine!  
Thank you so much for your time!

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**Author:** ![system](https://forum-cdn.knime.com/uploads/default/original/1X/ab3ccf34482a0329361734a18199390177204f15.png) [@system](https://forum.knime.com/u/system)\
**Post date:** [February 24, 2022, 3:43pm UTC](https://forum.knime.com/t/windows-loop-start-error/39932/5 "2022-02-24T15:43:22Z")

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