how can i solve "name 'data_df' is not defined error"? - database

data training code error
I wanted to solve this for data training. But its giving this error and I don't know how to solve. Tried to solve it via many methods but still stuck on this.
I tried to rename it but couldn't get it solved.

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Problems with deployment

I keep coming across this issue on various deployment sites.
"Looks like you've followed a broken link or entered a URL that doesn't exist on this site."
I've searched through here so much that I figured I'd finally ask myself, since I never found a solution. Idk what I'm missing, and I'm happy to share screenshots if those will be any help. I just don't even know what to post/look for at this point
I tried many suggestions on here, and I was expecting some code that I was missing, or a step that I was missing. But I've been following suggestions and tutorials to a T and it's still not working, so I'm at a loss

"There was an error retrieving this Add-on's configuration"

I'm working on a connector. I have the following error when I'm trying to deploy my script:
There was an error retrieving this Add-on's configuration.
What does it mean?
It's hard to say without seeing the code / knowing what you are trying to do.
Several possibilities:
getConfig is not defined or returns wrong values.
getConfig has an error.

Attempt to invoke virtual method java.lang.String.android.content.Context.getPackageName() on null object reference

I have gone through so many git issues and stackoverflow questions but unable to find the exact solution.
I am getting error :
Attempt to invoke virtual method java.lang.String.android.content.Context.getPackageName() on null object reference
I know that it is related to Package where im going to access method of a package but actually unable to access.
Also i dont have any clue that in which file it happened.
Dont know about the exact file, where it is occuring, do let me know if anyone can help me with this.

SQLException Obtaining more information

Currently working with converting SQLException error messages into messages that are more useful for the end user. My largest issue has been finding the information I'm looking for.
For instance, error code 8114 is
"Error converting data type [Type1] to [Type2]"
And error code 8152 is
"String or binary data would be truncated"
Using ADO.NET in VB.NET with SQLServer, is there a simple way to figure out which columns are affected by these errors?
The problem is that the error from SQL Server does not give that information so the only way to identify which field is causing the issue is to break apart your SQL statement to run it for the separate fields individually. That sounds like a lot of work for something the developer should be testing to make sure that it does not happen to begin with. There are errors that are not the developer's fault, but the two you listed here are things the developer should be keeping from happening and should be part of the unit tests for the process.
Some of the errors I can think of that are not a developer error, are ones to do with connection errors with SQL Server or corruption errors with the database.
I actually like the fact that my user's can't always figure out what is causing the problem because it tends to force them to tell me there is a problem with my program. If they figure out how to get around an error that I should have fixed, they tend to not tell me there is a problem and sometimes it has been years before I found out there was an issue.

Issue with DataContractSurrogate in the Debugger

Having big issues running my project locally. When I run it and get to this piece of code.
_institutionRepository.All();
when i step over this with debugger I get this inside the _institutionRepository object
Results View = The type 'Project1.Entities.DataAccess.Institution' exists in both 'Project1.Entities.DataAccess.dll' and 'DataContractSurrogates_40d75f07-afb1-4694-833a-ea508af1e0ac'
But when the rest of my team runs this locally they do not get this issue. I have been researching this for too long and need to get this resolved quickly. Any ideas would be appreciated.
i am running on VS2010 with silverlight and RiaSerivces
I am still not sure of this message. but we found the issue and it had nothing to do with the message received. One of our fields in the DB is supposed to be one of two types and we had the wrong one entered. So i am receiving data back. But this error/message is there with every entity in our solution. I would like to know more about it.

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