[BUG] fails to start using cargo run --release

[futuretech6]

Log:

$ cargo run --release
    Finished release [optimized] target(s) in 0.12s
     Running `target/release/miners`
succeeded in placing room #1 on attempt 1 with params: w:4, h:6, x:37, y:21
succeeded in placing room #2 on attempt 1 with params: w:6, h:7, x:66, y:11
succeeded in placing room #3 on attempt 1 with params: w:7, h:9, x:28, y:25
succeeded in placing room #4 on attempt 1 with params: w:9, h:5, x:21, y:7
failed to generate room #5 on attempt 1 with params: w:5, h:4, x:66, y:17
failed to generate room #5 on attempt 2 with params: w:4, h:9, x:24, y:23
succeeded in placing room #5 on attempt 3 with params: w:6, h:5, x:20, y:21
succeeded in placing room #6 on attempt 1 with params: w:4, h:4, x:9, y:36
failed to generate room #7 on attempt 1 with params: w:6, h:9, x:7, y:29
failed to generate room #7 on attempt 2 with params: w:9, h:6, x:66, y:6
succeeded in placing room #7 on attempt 3 with params: w:7, h:7, x:45, y:27
failed to generate room #8 on attempt 1 with params: w:6, h:8, x:72, y:15
failed to generate room #8 on attempt 2 with params: w:7, h:4, x:39, y:34
succeeded in placing room #8 on attempt 3 with params: w:4, h:5, x:10, y:14
failed to generate room #9 on attempt 1 with params: w:6, h:5, x:37, y:19
succeeded in placing room #9 on attempt 2 with params: w:6, h:5, x:7, y:20
failed to generate room #10 on attempt 1 with params: w:4, h:6, x:25, y:18
failed to generate room #10 on attempt 2 with params: w:9, h:6, x:13, y:25
failed to generate room #10 on attempt 2 with params: w:9, h:6, x:13, y:25
succeeded in placing room #10 on attempt 3 with params: w:5, h:4, x:15, y:14
Error sending request: Resource temporarily unavailable