Android Question error while compiling

[HansDieter]

B4A Version: 9.00
Parse den Code.    (0.03s)
Building folders structure.    (0.14s)
Kompiliere den Code.    (0.14s)
Kompiliere Layoutcode.    (0.09s)
Organisiere Libraries.    (0.00s)
Generiere R Datei.    (0.00s)
Kompiliere Debugger-Code    (8.04s)
Kompiliere generierten Java Code.    (9.11s)
Byte-Code konvertieren - optimiert dex.    Error
Uncaught translation error: com.android.dx.cf.code.SimException: signature-polymorphic method called without --min-sdk-version >= 26
Uncaught translation error: com.android.dx.cf.code.SimException: signature-polymorphic method called without --min-sdk-version >= 26
2 errors; aborting

If i remove the library "jMsgboxes", my app compiles fine. Any ideas?

 

[DonManfred]

jMsgboxes? Are you sure it is a B4A Library?

 

[Erel]

It is an old B4J library which you shouldn't use at all.

 

[HansDieter]

How comes the library in my B4A library manager?

 

[Computersmith64]

How comes the library in my B4A library manager?

Because either:

a) You have set the Additional Libraries path incorrectly; or
b) You have accidentally copied the library to either your B4A Libraries or Additional Libraries folder.

- Colin.