SharePoint 2010 Foundation - Web Part Error

[Myzan]

The "user" is trying to "edit" a row on a list : he gets " Web Part Error : One of the properties of the webpart has an incorrect format. MS SP Foundation cannot deserialize the web part. Check the format of the properties and try again".

Help appreciated.
Images attached.

[Myzan]

Some notes from forums :

1. First make sure your SharePoint server is on the latest patch level. After that, download the ProcMon from SysInternals, set the correct filters in order to avoid the deluge of information, and find out if you have an access denied exception on the Windows temp folder.
2. Check if you have enough Disk Space available for your Database or not? Clear unwanted files and free some solid (atleast 10GB) disk space.
3. Someone said - I found the error. It was an issue with the web.config file. There were some parameters that needed to be changed for the trust level and session variables.

[Myzan]

Another clue from Blogs - [url][url]http://sharepointgoose.blogspot.com/2010/03/web-part-error-one-of-properties-of-web.html[/url][/url]
: By examining configuration file (web.config) of that SharePoint Web Application, it was noticed that there was a mistake in a Safe Control entry in Safe Controls section and this mistake was done by me while entering a safe control entry for a newly deployed web part. After removing that entry or making it correct, error gone and all web parts were working good.

[mafid]

Hi,
We have made the required changes and permissions, please try now and tell me the results.

Regards,
Mafid

[Myzan]

Solved by Madhur

Hi,
We reset permissions on temp folders and restarted application pool for the fix.

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Best regards,
Madhur