Hi,
Can you please check whats the Patch level for below 5 BI Java components for SP12 for 740.
It seems like you are on Patch 0 and patch 0 does not help.
If you are on Patch 0 for SP12 , please apply Patch 20 for SP12 for below 5 components.
Please Restart your Java server and check the issue again.
BI-BASE-B
BI-BASE-E
BI-BASE-S
BI-IBC
BI-WEBAPP
Whenever you do system upgrade and face any issues try to search for SAP notes as mostly you can find yourself for such issues as for your issue also below note is available.
2211274 - BEx Web 7.3+: Warning message mime object does not exists
Regards,
Amit