I'm now trying to build the latest trunk version: revision 28012

I'm getting an error:

...

clientapi:

api:
     [echo] Build API sources
    [javac] Compiling 1685 source files to /home/ldashevs/Labkey/release/build/modules/api/classes
    [javac] /home/ldashevs/Labkey/release/server/api/src/org/labkey/api/data/LabKeyScope.java:61: error: method does not override or implement a method from a supertype
    [javac] @Override
    [javac] ^
    [javac] /home/ldashevs/Labkey/release/server/api/src/org/labkey/api/data/LabKeyScope.java:74: error: method does not override or implement a method from a supertype
    [javac] @Override
    [javac] ^
    [javac] /home/ldashevs/Labkey/release/server/api/src/org/labkey/api/data/LabKeyScope.java:90: error: method does not override or implement a method from a supertype
    [javac] @Override
    [javac] ^
    [javac] /home/ldashevs/Labkey/release/server/api/src/org/labkey/api/data/LabKeyScope.java:112: error: method loadSchema in class DbScope cannot be applied to given types;
    [javac] DbSchema schema = super.loadSchema(schemaName);
    [javac] ^
    [javac] required: String,DbSchemaType
    [javac] found: String
    [javac] reason: actual and formal argument lists differ in length
    [javac] /home/ldashevs/Labkey/release/server/api/src/org/labkey/api/data/LabKeyScope.java:105: error: method does not override or implement a method from a supertype
    [javac] @Override
    [javac] ^
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] Note: Some input files use unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 5 errors

BUILD FAILED
/home/ldashevs/Labkey/release/server/build.xml:1843: The following error occurred while executing this line:
/home/ldashevs/Labkey/release/server/build.xml:664: The following error occurred while executing this line:
/home/ldashevs/Labkey/release/server/build.xml:1499: The following error occurred while executing this line:
/home/ldashevs/Labkey/release/server/build.xml:756: Compile failed; see the compiler error output for details.

What is going on there?
Thanks.