I have created a custom button in salesforce account using visualsource page. The button was working fine till yesterday morning. After that whiile executing the code got an error as  "Failed to load resource: the server responded with a status of 500 (Server Error)
send @ connection.js:595
PearlBtn?id=0061t000008MKxrAAG&tour=&isdtp=p1&sfdcIFrameOrigin=https%3A%2F%2Fgreencrosstraining.lightning.force.com&sfdcIFrameHost=web&nonce=f09fc07f85f4d913a716b69e313d3a03ef06c8efbeea90c656c50ffceff3666d&ltn_app_id=06m1t000000ZIQzAAO&clc=0:56 An unexpected Error has Occurred. Error: {faultcode:'sf:INVALID_SESSION_ID', faultstring:'INVALID_SESSION_ID: Invalid Session ID found in SessionHeader: Illegal Session', detail:{UnexpectedErrorFault:{exceptionCode:'INVALID_SESSION_ID', exceptionMessage:'Invalid Session ID found in SessionHeader: Illegal Session', }, }, }".

Please clear my doubt as it is urgent.

Thanks

I have created a custom button in salesforce account using visualsource page. The button was working fine till yesterday morning. After that whiile executing the code got an error as  "Failed to load resource: the server responded with a status of 500 (Server Error)
send @ connection.js:595
PearlBtn?id=0061t000008MKxrAAG&tour=&isdtp=p1&sfdcIFrameOrigin=https%3A%2F%2Fgreencrosstraining.lightning.force.com&sfdcIFrameHost=web&nonce=f09fc07f85f4d913a716b69e313d3a03ef06c8efbeea90c656c50ffceff3666d&ltn_app_id=06m1t000000ZIQzAAO&clc=0:56 An unexpected Error has Occurred. Error: {faultcode:'sf:INVALID_SESSION_ID', faultstring:'INVALID_SESSION_ID: Invalid Session ID found in SessionHeader: Illegal Session', detail:{UnexpectedErrorFault:{exceptionCode:'INVALID_SESSION_ID', exceptionMessage:'Invalid Session ID found in SessionHeader: Illegal Session', }, }, }".

Please clear my doubt as it is urgent.

Thanks