ls command not working from terminal

Hello Team,

I am not sure why but my 'ls' command seems to have stopped working. Everytime from terminal I have to run 'export PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin' command and then everything seems to run fine. Can someone please help me here...

my .bash_profile file:

# Setting PATH for Python 3.7

# The original version is saved in .bash_profile.pysave

PATH="/Library/Frameworks/Python.framework/Versions/3.7/bin:${PATH}"

export PATH

export PATH="/usr/local/opt/gettext/bin:$PATH"

export PATH="/usr/local/opt/openssl/bin:$PATH"

export PATH=/opt/apache-maven-3.5.4/bin:$PATH

export PATH=/usr/local/apache-maven-3.5.4/bin:$PATH

export JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home"

export HADOOP_HOME="/Users/username/hadoop-2.9.1"

export PATH="/usr/local/opt/icu4c/bin:$PATH"

export PATH="/usr/local/opt/icu4c/sbin:$PATH"

export PATH="/usr/local/opt/sqlite/bin:$PATH"

export PATH="/usr/local/bin:$PATH"

export YARN_CONF_DIR=$HADOOP_HOME/etc/hadoop

export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin