The error info:
[Excel Destination [20]] Error: SSIS Error Code DTS_E_CANNOTACQUIRECONNECTIONFROMCONNECTIONMANAGER.   The AcquireConnection method call to the connection manager “Excel Connection Manager” failed with error code 0xC0209303.   There may be error messages posted before this with more information on why the AcquireConnection method call failed.
[SSIS. Pipeline] Error: Excel Destination failed validation and returned error code 0xC020801C.

The solution:
1. Click Project in the solution,

2. Do the following on the project property form