Android upgrading sql database using android-sqlite-asset-helper

I am using android-sqlite-asset-helper. I have a database file which I am using only to read some entries. I have a new database file which I want to upgrade and I am following the instructions as per the documentation here. As per the description, I have to generate SQL commands text file with certain name format. I used SQLite Compare Utility to generate commands. As the tables differ by only an entry in data element, I am getting a simple SQL command file which is:

    -- Generated by SQLite Compare utility

-- The script can be used to migrate database
-- C:\database_06102015_experiment\olddatabase\vibhakti_pratyaya_san.sqlite schema
-- to the schema of database
-- C:\database_06102015_experiment\vibhakti_pratyaya_san.sqlite

BEGIN TRANSACTION;


COMMIT TRANSACTION;

When I copy the SQL command file and database ZIP file (which contains the *-v2.db file only) and run I get these errors:

06-11 13:30:55.140: I/SQLiteAssetHelper(1093): successfully opened database vibhakti_pratyaya_san
06-11 13:30:55.140: W/SQLiteAssetHelper(1093): Upgrading database vibhakti_pratyaya_san from version 1 to 2...
06-11 13:30:55.150: W/SQLiteAssetHelper(1093): processing upgrade: databases/vibhakti_pratyaya_san_upgrade_1-2.sql
06-11 13:30:55.160: E/SQLiteLog(1093): (1) statement aborts at 2: [-- Generated by SQLite Compare utility

06-11 13:30:55.160: E/SQLiteLog(1093): 

06-11 13:30:55.160: E/SQLiteLog(1093): -- The script can be used to migrate database

06-11 13:30:55.160: E/SQLiteLog(1093): -- C:\database_06102015_experiment\olddatabase\vibhak
06-11 13:30:55.220: E/SQLiteAssetHelper(1093): Couldn't open vibhakti_pratyaya_san for writing (will try read-only):
06-11 13:30:55.220: E/SQLiteAssetHelper(1093): android.database.sqlite.SQLiteException: cannot start a transaction within a transaction (code 1)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.database.sqlite.SQLiteConnection.nativeExecuteForChangedRowCount(Native Method)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.database.sqlite.SQLiteConnection.executeForChangedRowCount(SQLiteConnection.java:734)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.database.sqlite.SQLiteSession.executeForChangedRowCount(SQLiteSession.java:754)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.database.sqlite.SQLiteStatement.executeUpdateDelete(SQLiteStatement.java:64)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1674)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1603)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.onUpgrade(SQLiteAssetHelper.java:326)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getWritableDatabase(SQLiteAssetHelper.java:199)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getReadableDatabase(SQLiteAssetHelper.java:257)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at com.mamillasoft.vipra_sanskrit.MyDatabase.getAllLikeList(MyDatabase.java:345)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at com.mamillasoft.vipra_sanskrit.MainActivity.onCreate(MainActivity.java:334)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.app.Activity.performCreate(Activity.java:5133)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.app.ActivityThread.access$600(ActivityThread.java:141)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.os.Handler.dispatchMessage(Handler.java:99)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.os.Looper.loop(Looper.java:137)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at android.app.ActivityThread.main(ActivityThread.java:5103)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at java.lang.reflect.Method.invokeNative(Native Method)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at java.lang.reflect.Method.invoke(Method.java:525)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
06-11 13:30:55.220: E/SQLiteAssetHelper(1093):  at dalvik.system.NativeStart.main(Native Method)
06-11 13:30:55.241: D/AndroidRuntime(1093): Shutting down VM

Question: 1. Why is it not able to open database to write? 2. What is the meaning of exception - cannot start a transaction within a transaction 3. Why are the comments in SQL command file treated as code line?