Libs created with 2.5 not compatible with previous versions?

Compiling code. 0.01
Compiling layouts code. 0.00
Generating R file. 0.26
Compiling generated Java code. Error
B4A line: 12
db.CreateDataBase(0, \
javac 1.6.0_23
src\b4a\example\main.java:253: cannot access anywheresoftware.b4a.B4AClass.ImplB4AClass
class file for anywheresoftware.b4a.B4AClass$ImplB4AClass not found
_db._vv1((int)(0),"database1.dat",anywheresoftware.b4a.keywords.Common.File.getDirInternal(),new String[]{"var1","var2","var3"});
^
1 error

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