Avrdude:verification error

i did upload the same scetch to my 3d printer as normal.
it stop with some error
so i triet again and get this error:

De schets gebruikt 144784 bytes (57%) programma-opslagruimte. Maximum is 253952 bytes.
Globale variabelen gebruiken 5142 bytes (62%) van het dynamisch geheugen. Resteren 3050 bytes voor lokale variabelen. Maximum is 8192 bytes.
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: verification error, first mismatch at byte 0x12500
0xff != 0x9e
avrdude: verification error; content mismatch
avrdude: verification error; content mismatch

if i trie to upload blink or some other sketch there is upload no poroblem
but if i trie to upload my 3d printersketch i get this error.

i dont know what to do anny help realy [\preasiated

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