Windows 10: Application run on an RDP client throws "System Error. Code: 1400. Invalid window handle."...

The scenario bear with me, its long is that we have a windows forms application written in Delphi 10.2. As part of this application there is a diary that keeps track of appointments. There are as many as 50 appointment slots in each column and as many as 15 different practitioners being tracked. So, it is a reasonably complex screen. Users can add, delete and move appointments. Add to this fact that users may open multiple instances of the application to track different practices and the diaries refresh the screen every 1 minute Makes a call to the DB and refreshes all the appointments.On

:)

 

What is this EOSError code 1400 error ?

Exception EOSError in module XPPENwin_3.3.9.220815.tmp at 000148C1

System error. Code 1400

Invalid window handle

How do i fix this error ?

 

System error 1400 invalid window handle while accessing a file from email.

Original Title: System error 1400 invalid window handle

Hello,

Last weekend my computer got the blue screen of death. I went and had the Geek Squad back up my hard drive and repair the computer. I have also updated to windows 10. I use Incredimail for my email and when I went to open a file it says I have a system error
1400 inalid window handle. Luckily I have a laptop as a back up and I am able to use it with the Incredimail to get the file open. Anyone have any ideas on what to do. With everything that has gone on with this thing over the last few days it is stressing
me out. Thank You

 

the handle is invalid HELP!

I'm going through the same thing right now. i tried to go in and come in on safe mode but it still would give me the same error. Now it will take my password, start to log in and bring up my main screen but it blip then goes back to the sign in page where i put my password in it would give that 'invalid handle" message.