Object Reference Not set to instance of an object - SSRS on Sharepoint - sharepoint

I see there's been quite a few topics covering this error on Sharepoint, but not quite one where it happened to someone who's been using SSRS.
So I have this report which users need to access, with most of them it opens fine and they can use it.
But recently, two new users can't open the report.
They get the following error:
I tried to google and see whats wrong, but I cant find anything.

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More insights of ErrorMessage in Microsoft Online

I'm developing an Office.js based TaskPane Add-in. Recently I see frequently following error message which appears randomly:
Sorry, there was a problem saving your document.
Tell us about this problem to help us fix it. Give feedback to
Microsoft
Session ID: 1334d772-005e-4fcf-9ef0-6d5e19b56865 Please tell Microsoft
about this problem. We have created an error report that you can send
to help us improve Word Online. This report will include a copy of
your document which we will only use to investigate the error.
How can I get insight into this "Report" which is being sent to Microsoft?
The console.log itself doesn't show anything. Is there a way to figure out what might have caused this message?
Even playing around with the Script Lab I receive the same popup error message.
The issue can be more or less reliably reproduced by
Openin
opening a new word document in Microsoft Online
Opening Script Lab Code
Opening Script Lab Run
Selecting the Code example for 'Content control basics'
Running the example
interact with the example to insert and modify content controls
After a random period of time, the message pops up
Update: Issue was addressed and fixed by the Microsoft Office Team:
https://github.com/OfficeDev/office-js/issues/54#issuecomment-364346330

SSRS DataSource Windows Authentication fails

I have a project which uses SharePoint lists as data sources to create the reports. I'm using Visual Studio 2013 for this.
I have this real annoying issue at this moment, ie. when I want to edit a dataset I created a while ago and I press 'Query Designer...' in the dataset properties to see all fields from my list I get an error which says that I am unauthorized.
My DataSource is configured to link to the SharePoint Site Url with Windows Credentials. I have also tried this out for multiple datasets on multiple reports but the error is everywhere.
Because of this I'm also not able to run my reports. They just say "An error occurred during local report processing.".
I have been working on this project since March and this is the first time this has occurred so I have no idea what might have gone wrong nor how to solve it.
Does anyone know what might cause this error and how to solve it please?
If you have any questions or remarks about my question/problem, please, don't hesitate to leave a comment.
Kind regards
EDIT 1:
I have just tried deploying a report that I finished last week and for the first time I got a prompt that asked for my credentials. I haven't even put my credentials anywhere in the project for past authorisation so I have no idea why the project would suddenly need it now...
EDIT 2:
I have just tried changing the DataSource credentials to my own login for the SharePoint Site. If I run the report I get the same error as before but when I go to Query Designer for one of the datasets I get following error:
EDIT 3:
I just restored a back-up I made a couple of weeks ago. I can now run my reports but I still get the Unauthorized error when I try to open a dataset's query designer and the prompt for my credentials when I try to deploy a report.
So, the solution has been found!
Apparently something has gone wrong with my PC and I had to reconfigure my user accounts.
To do this go to Control Panel -> User Accounts
Then click on 'Manage User Accounts'. Go to the 'Advanced' tab and click on 'Manage Passwords'
Next, go to 'Windows Credentials' and change the credentials for your site or recreate them.

Given path's format not supported error when moving report from Report Builder to VS 2012 report project

I created some reports in Report Builder for SQL 2012, before I realized that managing multiple reports is substantially easier in VS 2012. I created a reporting project in VS2012 and added the existing reports by right-clicking on the Reports icon in the solution tree, selecting Add ==> Existing Item and then navigating to and selecting the reports. I also added or recreated the data sources and data sets as needed.
Most of my reports "migrated" with no problems, and I was able to deploy them to a new dashboard and get a more unified experience for the users. However, a couple of the reports give the following error when I try to preview them:
The given path's format is not supported
Some of these reports deploy successfully and run in the SharePoint site, others do not. But my ask at this point is, can someone give me any tips on where to look for the cause of these errors? The Error and Output windows in VS2012 don't give file, line, or column info, so I just have no idea where to look. I have searched for as many URL or path references as I can in the query results, action targets, etc., and removed them when I found them, but the problem persists. If someone has any thoughts, or can tell me some settings to turn on in VS that might give me more information, that would be appreciated.

sharepoint online workflow activity crash

I have a workflow similar to the one from http://msdn.microsoft.com/en-us/magazine/hh288072.aspx.
Most of the time it works great. Sometimes however, it crashes and then says "An error has occurred in workflow CreateSiteFlow". The site then has been created successfully.
I found some references to the same problem, but all say to look at the log files. How does this work for SharePoint Online, or has someone guidelines for what could be wrong?
I found some references online about time-outs regarding to workflows. But I cannot find any specifics about this, and also I'm unable to see long time (including seconds, or even more precise) in the reports of the workflow..
Regards,
Matthijs ter Woord

Permissions problems with Excel Services in SharePoint

I'm trying to implement an Excel Services reporting solution in SharePoint (MOSS). Since the source data is a SharePoint list, this problem is doubly frustrating. I keep bumping up against permissions problems, even though I've enabled virtually everything in sight.
The first error is about refreshing external data - it's not (really) external data, but that's a semantic point.
The second error is a cryptic "Excel Web Access" problem.
Anyone get this to work??
Could be a couple different problems. The first possibility is that Excel Services doesn't support using SharePoint list data (crazy I know)... although this only applies if you try using the type of embedded data source you get if you choose Export to Excel from a list (again, I know crazy).
However an easy way around this problem is to use the SP webservices to get you list data. I had a macro written by someone at MS a while back that automated this conversion, if I canfind a link I'll post it. If you are using Kerberos then you task is probably finished. If using NTLM then you may need to also configure an SSO application so that the right credentials can be passed to the webservice (or any other data source for that matter). There's a pretty good step by step here.
One kind of "hack" to get this to work via UDF's (which if trusted, custom code can be deployed and made available via Excel Services) can be found here.

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