I uses radaee pdf library.I am getting below error now.what is this error ?
[javac] Compiling 38 source files to C:\Users\...\.jenkins\jobs\PDFDisplayModuleAndroid\workspace\PDFDisplayModuleLib\sph-st-android-pdfreader\bin\classes
[javac] C:\Users\....\.jenkins\jobs\PDFDisplayModuleAndroid\workspace\PDFDisplayModuleLib\sph-st-android-pdfreader\src\com\radaee\reader\PDFReaderAct.java:500: error: constant expression required
[javac] case R.id.btn_ink:
[javac] ^
[javac] C:\Users\...\.jenkins\jobs\PDFDisplayModuleAndroid\workspace\PDFDisplayModuleLib\sph-st-android-pdfreader\src\com\radaee\reader\PDFReaderAct.java:503: error: constant expression required
[javac] case R.id.btn_rect:
[javac] ^
[javac] C:\Users\...\.jenkins\jobs\PDFDisplayModuleAndroid\workspace\PDFDisplayModuleLib\sph-st-android-pdfreader\src\com\radaee\reader\PDFReaderAct.java:506: error: constant expression required
[javac] case R.id.btn_oval:
[javac] ^
[javac] C:\Users\....\.jenkins\jobs\PDFDisplayModuleAndroid\workspace\PDFDisplayModuleLib\sph-st-android-pdfreader\src\com\radaee\reader\PDFReaderAct.java:509: error: constant expression required
[javac] case R.id.btn_note:
[javac]