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I have a custom list form created in Designer. It displays in Designer but in the browser I get the following error
Unable to display this Web Part. To troubleshoot the problem, open this Web page in a Windows SharePoint Services-compatible HTML editor such as Microsoft Office SharePoint Designer. If the problem persists, contact your Web server administrator.
How can I work out where in the page the problem is?
When I have experienced this error, it's usually do to invalid XSLT in the web part. Something as simple as leaving off a quote or a backslash will result in this error when loading your page. Sometimes I even have to blow away the web part and start over because I can't find anything wrong after staring at the code. But when I do find the problem, it's usually something super simple that I missed.
If this is 2007 or 2010, looking at the page in SharePoint Designer's design view should give you a better clue as to what's broken. Invalid XSLT will usually show an error on the page there like "Error: invalid token -->@@<--." or something like that.
More details on what the web part does would be helpful. But some steps you can use to trouble shoot.
make sure the resources the webpart is using has the right permissions. For Eg. The webpart may be accessing data from site assets/style library etc. So check the permissions of user on the corresponding library from webpart. If the user doesnt have the necessary permission then you wont be able to see the webpart n SP will give you error "Unable to display this Web Part"
It Worked for me. Check!
