ESP Now Guru meditation error

This is my error. It’s an ESP Now sender with 4 sensors. The first lines of the program are running- ‘failed to add peer’ is at line 130 in setup, before void loop. Wire is not a library. The two I2C sensors raised no issues at all until yesterday with this error.

ELF file SHA256: 0000000000000000

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Brownout detector was triggered

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Mode: STA
Channel: 1
SSID (12): TP-Link_7C28
Passphrase (8): 64411811
BSSID set: 0
Mode: STA
Channel: 2
SSID (12): TP-Link_7C28
Passphrase (8): 64411811
BSSID set: 0
E (2737) ESPNOW: Peer interface is invalid
Failed to add peer
Guru Meditation Error: Core 1 panic’ed (LoadProhibited). Exception was unhandled.

Core 1 register dump:
PC : 0x400d499e PS : 0x00060630 A0 : 0x800d4b08 A1 : 0x3ffb2770
A2 : 0x00000000 A3 : 0x00000039 A4 : 0x00000001 A5 : 0x00000001
A6 : 0x00000100 A7 : 0x00000000 A8 : 0x800d7ab8 A9 : 0x3ffb2770
A10 : 0x0000003f A11 : 0x3ffbf148 A12 : 0x00000040 A13 : 0x3ffb2680
A14 : 0x00000000 A15 : 0x00000000 SAR : 0x00000018 EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000134 LBEG : 0x40089630 LEND : 0x40089646 LCOUNT : 0x00000000

Backtrace:0x400d499b:0x3ffb27700x400d4b05:0x3ffb27b0 0x400d6171:0x3ffb27d0 0x400d287f:0x3ffb27f0 0x400d8269:0x3ffb2820
#0 0x400d499b:0x3ffb27700 in TwoWire::requestFrom(unsigned short, unsigned int,
bool) at C:/Users/joema/.platformio/packages/framework-arduinoespressif32/libraries/Wire/src/Wire.cpp:359

ESP Now peer interface is invalid- I haven’t touched the ESP Now code at all, beyond the struct elements.