title: Error : [kapt] java.lang.IllegalArgumentException: @androidx.room.ColumnInfo does not define an element defaultValue()
body: <p>My gradle contain these dependencies</p>
  
  <pre><code>implementation 'androidx.room:room-runtime:2.1.0'
  annotationProcessor 'androidx.room:room-compiler:2.1.0'
  kapt "androidx.room:room-compiler:2.2.0-alpha01"
  </code></pre>
  
  <p>And My model class is</p>
  
  <pre><code>    @Entity(tableName = "SubjectDetail")
      public class SubjectDetail implements Parcelable {
  
          @PrimaryKey
          @SerializedName("id")
          @ColumnInfo(name = "id")
          @Expose
          private int id=0;
  
          @ColumnInfo(name = "medium")
          @SerializedName("medium")
          @Expose
          private String medium="";
  
          @ColumnInfo(name = "class")
          @SerializedName("class")
          @Expose
          private String standard="";
  
          @ColumnInfo(name = "subject")
          @SerializedName("subject")
          @Expose
          private String subject="";
  
          @ColumnInfo(name = "part1")
          @SerializedName("part1")
          @Expose
          private String part1="";
  
          @ColumnInfo(name = "partt2")
          @SerializedName("partt2")
          @Expose
          private String partt2="";
  
          @ColumnInfo(name = "part3")
          @SerializedName("part3")
          @Expose
          private String part3="";
  
          @ColumnInfo(name = "downloadurl1")
          @SerializedName("downloadurl1")
          @Expose
          private String downloadurl1="";
  
          @ColumnInfo(name = "downloadurl2")
          @SerializedName("downloadurl2")
          @Expose
          private String downloadurl2="";
  
          @ColumnInfo(name = "downloadurl3")
          @SerializedName("downloadurl3")
          @Expose
          private String downloadurl3="";
  
          @SerializedName("created_at")
          @Expose
          @ColumnInfo(name = "createdAt")
          private String createdAt;
  
          @SerializedName("updated_at")
          @Expose
          @ColumnInfo(name = "updatedAt")
          private String updatedAt;
  
  
  }
  </code></pre>
  
  <p>Log details</p>
  
  <blockquote>
    <p>Task :app:kaptProductionDebugKotlin FAILED e: [kapt] An exception
    occurred: java.lang.IllegalArgumentException:
    @androidx.room.ColumnInfo does not define an element defaultValue()
      at
    com.google.auto.common.AnnotationMirrors.getAnnotationElementAndValue(AnnotationMirrors.java:134)
      at
    com.google.auto.common.AnnotationMirrors.getAnnotationValue(AnnotationMirrors.java:114)
      at androidx.room.ext.Element_extKt.box(element_ext.kt:120)  at
    androidx.room.ext.Element_extKt.toAnnotationBox(element_ext.kt:166)
      at
    androidx.room.processor.FieldProcessor.process(FieldProcessor.kt:42)
      at
    androidx.room.processor.PojoProcessor.doProcess(PojoProcessor.kt:171)
      at
    androidx.room.processor.PojoProcessor.access$doProcess(PojoProcessor.kt:76)
      at
    androidx.room.processor.PojoProcessor$process$1.invoke(PojoProcessor.kt:129)
      at
    androidx.room.processor.PojoProcessor$process$1.invoke(PojoProcessor.kt:76)
      at androidx.room.processor.cache.Cache$Bucket.get(Cache.kt:49)  at
    androidx.room.processor.PojoProcessor.process(PojoProcessor.kt:126)
      at
    androidx.room.processor.TableEntityProcessor.doProcess(TableEntityProcessor.kt:93)
      at
    androidx.room.processor.TableEntityProcessor.access$doProcess(TableEntityProcessor.kt:47)
      at
    androidx.room.processor.TableEntityProcessor$process$1.invoke(TableEntityProcessor.kt:56)
      at
    androidx.room.processor.TableEntityProcessor$process$1.invoke(TableEntityProcessor.kt:47)
      at androidx.room.processor.cache.Cache$Bucket.get(Cache.kt:49)  at
    androidx.room.processor.TableEntityProcessor.process(TableEntityProcessor.kt:55)
      at
    androidx.room.processor.DatabaseProcessor.processEntities(DatabaseProcessor.kt:286)
      at
    androidx.room.processor.DatabaseProcessor.doProcess(DatabaseProcessor.kt:66)
      at
    androidx.room.processor.DatabaseProcessor.process(DatabaseProcessor.kt:57)
      at</p>
  </blockquote>