Type Error: _2a is null

Hi All,

When I try to perform some action like expand the artifacts,change the view etc under Plan.I get the below error.

TypeError: _2a is null
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_17@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:961:19
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_1.xhr/<@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:6559:1
_12@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2685:9
_b@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2677:1
_11/this.resolve@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2767:1
_1a@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2723:1
_12@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2696:1
_b@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2677:1
_11/this.resolve@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2767:1
_1a@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2723:1
_12@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2703:1
_b@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2677:1
_11/this.resolve@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2767:1
_1a@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2723:1
_12@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2696:1
_b@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2677:1
_11/this.resolve@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:2767:1
_6@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:6185:1
_13@https://hostname/ccm/web/_js/?include=B~&etag=HKErTluL8hI_en_US&_proxyURL=%2Fccm&ss=KTQCk&locale=en-us:6202:1

Please help me resolving this error.

Thanks in advance!

Regards,
Suvidya