InfoPath Dev

Great, so hopefully what I was trying to explain made sense - I think you just had the subpackage dropdown configured wrong for the value field. :)

I could see in the form files that there were still files intended for including offline data - apparently changing that setting didn't clean up the form files. I've manually removed them and the references to them in this copy of the form - maybe try this one, but I'd verify the data connections work first. Did you originally design ...

Before publishing only I have done the modifications for the data connection by removing it from offline mode even this doesn't helped

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So - you disabled all your form load rules, and republished your form, and you get the same error? Do you have any fields with default values that have a large number of rules being run? I also noticed that your form template had a number of XML files for use offline (which a browser form will never be) - I wonder if removing those would help, as ...

Yes,but the situation is same

You have to try to figure out what the issue is. The error now tells you the current issues with your form - that the default values or rules are taking too long to process. If this were an on premises server, you might be able to make configuration changes, but this is Office 365, right? So you have to figure out how to fix your form. Have you ...

Sorry, I am not as experienced as experienced as some. If this is a validation rule, why are you using "is not blank"? Shouldn't it be "is blank"? And is the validation rule placed on the submit button? or each check box?

but even if the errors continue is der any alternative for the issue

If it were my form, I'd start by disabling all the form load rules & see if it opened w/out an error. If it does, I'd start slowly re-enabling rules to see if I could isolate the issue.