Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/11701#issuecomment-197529534
Hmmm. I think this is because this code in `load-spark-env.sh`:
```
if [ -z "$SPARK_SCALA_VERSION" ]; then
USER_SCALA_VERSION_SET=0
ASSEMBLY_DIR2="${SPARK_HOME}/assembly/target/scala-2.11"
ASSEMBLY_DIR1="${SPARK_HOME}/assembly/target/scala-2.10"
if [[ -d "$ASSEMBLY_DIR2" && -d "$ASSEMBLY_DIR1" ]]; then
echo -e "Presence of build for both scala versions(SCALA 2.10 and SCALA
2.11) detected." 1>&2
echo -e 'Either clean one of them or, export SPARK_SCALA_VERSION=2.11
in spark-env.sh.' 1>&2
exit 1
fi
if [ -d "$ASSEMBLY_DIR2" ]; then
export SPARK_SCALA_VERSION="2.11"
else
export SPARK_SCALA_VERSION="2.10"
fi
else
USER_SCALA_VERSION_SET=1
fi
```
Since the assembly build is being skipped, it's defaulting to scala 2.10
and failing to find the classes.
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