Good day,
I can do well in vb6 but now installed full version of B4A and when starting it, pop up an error " the directory name is invalid" but it continues opening.By default was opening library manager and could see the list in the dialog.Due to that error I was forced to re-install the B4A.Now the library manager dialog comes empty and that error still there.I want lib related to sms, camera,map and call for my app.how do start that, please help.
The additional libraries path should be to a folder, into which you would add the .jar and .xml ( and sometimes .aar ) files from the additional libraries you download or create.
if you don't use additional libraries then leave it empty , also what you have placed as additional libraries is wrong "android build tools" why you added that ?
BAsed on the Path to android.jar it looks like you are reusing an old SDK Installation which is a mistake.
Using the new SDK MAnager you should use android.jar from level 27...
You can find the Setup-Instructions here. https://www.b4x.com/b4a.html
You also can watch this Video as it describes it clearly.
Start with a new Blank folder like you see in the Video.