There are already several topics regarding the Security header is not valid error. Please take a look at them:
https://community2.invoiceplane.com/t/error-security-header-is-not-valid/945
https://community2.invoiceplane.com/t/topic/1197
There are already several topics regarding the Security header is not valid error. Please take a look at them:
https://community2.invoiceplane.com/t/error-security-header-is-not-valid/945
https://community2.invoiceplane.com/t/topic/1197